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The Typology of Noun Phrase Structure from a Processing Perspective JOHN A. HAWKINS Abstract This paper examines cross-linguistic variation patterns in the syntax and morpho-syntax of Noun Phrases. The variation is surprising and not readily explainable in grammatical terms alone, but many of these patterns can be motivated in terms of on-line processing demands. Two processing hypotheses are proposed: anything that is an NP must be recognized as such, i.e. every NP must be "constructable"; and all the items that belong to NP must be "attachable" to it, and the amount of syntactic, morpho-syntactic or lexical encoding of attachment will be in proportion to complexity and efficiency in processing. Some predictions following from these hypotheses are defined. Typological generalizations and cross-linguistic data provide prima facie evidence for them, suggesting that processing has played a significant role in shaping grammars in this area. Keywords: agreement, case copying, classifiers, definite articles, fixed word order, head of phrase, lexical differentiation, nominalizing particles, noun phrase, parsing, possessive phrases, processing typology, projection 1. Introduction Noun phrases (NPs) exhibit a surprising amount of cross-linguistic variation in the morphosyntactic and syntactic devices that define their structure, and puzzling restrictions in the occurrence versus non-occurrence of these devices in different environments. Some languages have definite or indefinite articles, some have classifiers, some make extensive use of nominalizing particles, case marking is found in some, case copying throughout the noun phrase in a subset of these, other kinds of agreement patterns can be found on certain 2 modifiers, "linkers" exist in some languages for NP-internal constituents, a "construct state" attaches NP to a sister category in others, and so on. The positioning of these items within the NP also exhibits considerable variation. The grammatical rules generating them must sometimes guarantee their presence, sometimes their absence, in ways that require numerous formal stipulations and complications. My goal is to examine these variation patterns in NPs from a processing perspective. I will not present a detailed typology of the noun phrase. That has already been done, cf. e.g. Rijkhoff (2002) and Plank (2003). There have also been detailed studies of specific morphosyntactic devices characteristic of NPs, such as case marking and Suffixaufnahme (Plank 1995) and classifiers (Aikhenvald 2003). Rather, my goal will be to show that we can understand the variation better, and shed light on some of the puzzles, if we look at grammars in terms of processing. Predictions can be made for the existence of certain structural devices, and for their presence versus absence, on the basis of general principles that are supported, ultimately, by experimental and corpus findings from language performance. Looking at cross-linguistic variation in this interdisciplinary way is not straightforward. Linguists do not, in general, do so. They either construct a formal grammatical model for the patterns in question or conduct a typological survey. Psychologists do not do so either. They focus on performance data, generally from a restricted set of European languages. This methodological divide is unfortunate since I have argued (in Hawkins 1990, 1994, 2004), and a growing number of others have also argued (see e.g. Aissen 1999, Bresnan et al. 2001, Bybee & Hopper 2001, Dryer 1992, Haspelmath 1999, Kirby 1999, Newmeyer 2005), that many grammatical properties are correlated with what are ultimately processing and usage-based considerations including complexity, 3 efficiency and frequency. If this is so, then we need to initiate a more systematic dialogue between linguists and psychologists so that we can better understanding how processing works and how it has impacted grammars and led to typological variation. The purpose of this paper is to initiate such a dialogue with respect to the typology of the noun phrase. I shall make use of two simple and intuitive processing ideas that need to be incorporated in any model of comprehension (e.g. Fodor et al. 1974) or production (e.g. Levelt 1989). First, every phrase that is an NP has to be recognized as such in language use, i.e. it has to be "constructable" as an NP. Second, all the words and immediate constituents that are intended to belong to a given NP must be correctly recognized as belonging to it, i.e. they must be "attachable" to this NP, rather than to some other phrase. Noun phrases pose two challenges in this respect for any parser. First, NPs do not always contain nouns (Ns), i.e. the head category that "projects" to a mother NP, making it recognizable (cf. Jackendoff 1977, Pollard & Sag 1994) . An NP must therefore be "constructable" from a variety of other terminal categories that are dominated by NP, the precise nature of which can vary across languages. Mandarin de and Lahu ve can nominalize non-nominal categories or phrases. Definite articles, in languages that have them, often have a similar nominalizing function, constructing NP over a non-nominal part of speech or phrase. Second, it must be made clear in performance which terminal categories are to be "attached" to a given NP, as opposed to some other NP or to other phrases. Nominal agreement patterns on the immediate constituents of NP, as in Latin, signal such attachments. So does "case copying" in languages that have it. Such devices are particularly useful when 4 attachments are difficult, for example when the immediate constituents of NP are not adjacent to one another. These challenges for parsing must also be reflected, to a considerable extent at least, in a corresponding model for production. This paper defines two general hypotheses for "construction" and "attachment" in noun phrase processing, in sections 3 and 4, and it formulates some predictions that follow from these hypotheses. A range of typological patterns will be presented together with grammatical details from diverse languages that are relevant to these predictions, that test them and that appear to support them. They provide prima facie evidence for a general hypothesis regarding the performance-grammar interface that I defined in Hawkins (2004): (1) Performance-Grammar Correspondence Hypothesis (PGCH) Grammars have conventionalized syntactic structures in proportion to their degree of preference in performance, as evidenced by patterns of selection in corpora and by ease of processing in psycholinguistic experiments. The PGCH accounts for many universal and distributional regularities, it motivates many exceptions to current universals (Newmeyer 2005, Hawkins 2004), and it makes correct predictions for many variation patterns across grammars that are not currently predicted by grammatical considerations alone. The PGCH provides the ultimate motivation for the noun phrase predictions to be formulated here. The paper begins, in section 2, with a brief enumeration, primarily for the benefit of readers who are not typologists, of some major syntactic and morpho-syntactic devices across languages that appear to be relevant to any discussion of NP construction and NP attachment. 5 2. NP Construction and Attachment to NP 2.1 Construction Several categories construct NP: • Nouns (i.e. lexical items specialized for the category N) like student and professor in English • Pronouns (personal, demonstrative, interrogative, etc): he/she, this/that, who, and their counterparts in other languages, cf. Bhat (2004) • Various determiners including the definite article (in theories in which Determiner Phrase and NP are not distinguished, cf. Hawkins 1993, 1994, Payne 1993) [1] • Nominalizing particles like Lahu ve (Matisoff 1972), Mandarin de (Li & Thompson 981) and Cantonese ge (Matthews & Yip 1994:113) can combine with a non-noun or pronoun to construct a mother NP, as in the examples of (2), cf. C. Lehmann (1984:61-66): (2) a. np[chu ve] (Lahu) fat NOMINALIZER 'one that/who is fat' b. np[vp[chī hūn] eat meat de] (Mandarin) NOMINALIZER 'one who eats meat' c. np[vp[heui hōi-wúi] go ge] have-meeting NOMINALIZER 'those who are going to the meeting' (Cantonese) 6 • Classifiers in many languages perform syntactic functions that include the construction of NP (Aikhenvald 2003:87-90), which permits omission of nouns from NP, resulting in pronoun-like uses for classifiers, as in the following example from Jacaltec (Craig 1977:149): (3) xal naj pel chubil chuluj said CL Peter that naj hecal will-come CL/he tomorrow 'Peter said that he will come tomorrow' • Case particles or suffixes construct a case-labelled mother or grandmother NP respectively, cf. Hawkins (1994:ch.6) for detailed discussion, e.g. in Japanese, German, Russian: (4) a. npAcc[tegami o] (Japanese) letter ACC b. npAcc[den Tisch] (German) the-ACC-SG-MASC table c. npAcc[lip-u] (Russian) lime tree-ACC-SG-II 2.2 Attachment Various (morpho-)syntactic devices signal the attachment of sister categories to a given NP: • Adjective agreement is a clear instance, e.g. Latin adjectives agree in case, number and gender features with some np[N], see Vincent (1988), permitting separation of noun phrase constituents as in (5b): (5) a. np[illarum bonarum feminarum] that-GEN-PL-FEM good-GEN-PL-FEM woman-GEN-PL-FEM 7 'of those good women' b. pp[npi[magno] cum npi[periculo]] great-ABL-SG-NEUT with danger-ABL-SG-NEUT 'with great danger' • Case copying in "word-marking" Australian languages like Kalkatungu (Blake 1987, Plank [ed.] 1995) also signals attachment (to a similarly case-marked np[N]), permitting separation of NP constituents as in (6b): (6) a. npi[thuku-yu yaun-tu] npj[yanyi] dog-ERG big-ERG itya-mi white-man (Kalkatungu) bite-FUT 'The big dog will bite the white man' b. npi[thuku-yu] npj[yanyi] dog-ERG itya-mi npi[yaun-tu] white-man bite-FUT big-ERG These case suffixes also construct a case-marked mother or grandmother NP, as in (4). I.e. case markers can serve both to construct the dominating (case-labeled) NP and to attach the respective daughters with the same case to it. • Mandarin de similarly performs both an attachment and a construction function, attaching NP-dominated constituents together and constructing the mother NP, cf. the discussion in C. Lehmann (1984:63-66) from which the following examples are taken: (7) a. np[shuìjiòu de sleep rén] NOMLZ/ATTACH person 'sleeping person' b. np[[bù hăo] de lái-wăng] (Mandarin) 8 not good NOMLZ/ATTACH come-go 'undesirable contact' c. np[s[wŏ lái] de dìfáng] I come NOMLZ/ATTACH place 'place from which I am coming' d. np[s[wŏ vp[jiăn zhĭ]] de I jiăndao] cut paper NOMLZ/ATTACH scissors 'scissors with which I cut paper • Classifiers also attach NP-sisters to the NP that they construct, as in the following examples from Cantonese in which the classifier attaches a possessor to its head noun (8a) and a (preposed) relative clause to its head noun (8b), cf. Matthews & Yip (1994:107-12): (8) a. lóuhbáan ga chē boss (Cantonese) CL car 'the boss's car' b. ngóhdeih hái Faatgwok sihk dī we in France eat yéh CL food 'the food we ate in France' The repeated classifier -ma in the following example from Tariana functions like agreement in Latin (5) and case copying in Kalkatungu (6) to signal co-constituency between adjective and noun within NP (Aikhenvald 2003:94-5): nu-kapi-da-ma hanu-ma (1SG-hand-CL:ROUND-CL:SIDE big-CL:SIDE), 'the big side of my finger'. 9 • Linkers such as na in Tagalog attach ulól ('foolish') and unggó ('monkey') into a single NP in ulól na unggó ('foolish monkey'), cf. Hengeveld et al. (2004:553) • The construct state in Berber signals co-constituency between nouns (/NPs) in the construct state and a preceding noun (9b), quantity word (9c), preposition (9d), intransitive verb (9e), and transitive verb (9f) (Keenan 1988): (9) a. Free form: Construct form: aryaz 'man' arba 'boy' tarbatt 'girl' uryaz urba terbatt b. np[axam np[uryaz]] tent man-CONSTR 'tent of the man/the man's tent' c. np[yun uryaz] one man-CONSTR 'one man' d. pp[tama (n) np[uryaz]] near man-CONSTR 'near the man' e. s[lla IMPF vp[t-alla np[terbatt]]] she-cry girl-CONSTR 'The girl is crying' f. s[vp[i-annay np[urba] he-saw boy-CONSTR 'The boy saw the girl' np[tarbatt]]] girl (Berber) 10 The construct state signals attachment of these immediate constituents but does not unambiguously construct any particular mother or grandmother phrase. The mother most immediately dominating np[N] in the construct state can be NP, PP, or VP, etc. • A possessive (/genitive) -s in English (and similar forms in other languages) signals the attachment of PossP to the head N, and also the construction of a grandmother (or mother) NP (NPi in (10)): (10) npi[possp[npj[the king of England]-s] daughter] 3. The Constructability Hypothesis, its Predictions and Typological Patterns I begin with the following hypothesis, which is motivated by general considerations of parsing and parsability, by consideration of a large range of phrasal types in many languages, and by performance data from diverse language types, as summarized in Hawkins (1994, 2004): (11) The Constructability Hypothesis (cf. Hawkins 1994:379) For each phrasal node P there will be at least one word of category C dominated by P that can construct P on each occasion of use. It appears that there is always some category C that enables the parser to recognize that C is dominated by a phrase of a particular type, NP, PP, or VP, etc, generally as a daughter or as a granddaughter. Building hierarchical phrase structure trees in syntactic representations on the basis of terminal elements is a key part of grammatical processing. If a given P cannot be properly recognized (or "constructed"), its integration into the syntactic tree, and its semantic interpretation are at risk. So construction of mother nodes, or of grandmothers, is a vital part of successful parsing and production, and this is reflected in the cross-linguistic fact that grammars appear to have systematic devices for constructing each of their phrasal nodes.[2] 11 More generally, I have argued that the hypothesis in (11) motivates a lot of the grammatical properties of heads of phrases, both lexical and functional, and that it provides a processing explanation for this universal and for many related properties that involve head-like projection.[3] 3.1 NP Construction The Constructability Hypothesis in (11) leads to a prediction for the structure of NPs: (12) Prediction 1: NP Construction Any phrase that is of type NP must contain either (i) a lexical head N or pronoun (personal or demonstrative, etc) or proper name, or (ii) some other functional category that can construct NP on each occasion of use in the absence of N or Pro or Name. We expect NPs to contain either some lexical and inherent head category, therefore, like a noun or pronoun or name, on the basis of which NP can always be recognized; or alternatively we expect to find categories that project uniquely to NP being especially productive, and indeed obligatory, in the absence of nouns, pronouns and names. Examples are given in (13): (13) a. Lahu, Mandarin and Cantonese nominalizers, as in (2). b. Jacaltec classifiers, as in (3). c. English permits omission of nouns with certain restrictive adjectives plus the definite article as a constructor of NP, the rich, the poor, the good, the bad. We say I envy the rich, etc, not *I envy rich. 12 d. Spanish has expanded this option (lo difícil 'the difficult thing') to other categories such as infinitival VPs in el hacer esto fue fácil (DEF to-do this was easy) 'doing this was easy' (Lyons 1999:60). e. Malagasy has expanded it to locative adverbs, as in ny eto (DEF here), meaning 'the one(s) who is/are here' (Anderson & Keenan 1985:294). f. Case-marking on adjectives in e.g. Latin and German permits them to function as referential NPs, Latin bonī (good-Nom-Masc-Pl) „the good ones‟, German Gutes (good-Nom-Neut-Sg) „good stuff‟. g. In numerous languages the definite article signals a nominalization of some kind, e.g. Lakhota ktepi kį wąyake (kill DEF he-saw) 'he saw the killing' (Lyons 1999:60), or the construction of a subordinate clause in noun phrase position, e.g. as subject or object, in Huixtan Tzotzil and Quileute (Lyons 1999:60-61). h. Head-internal relatives are structurally clauses that function as NPs and that are regularly marked as such by definiteness markers and/or case particles and adpositions, as in Diegueno (Gorbet 1976, Basilico 1996). i. Free relatives can also consist of a clause functioning as an NP that is constructed by a nominalizing particle, e.g. in Cantonese léih mh ngoi ge (you not want Nominalizer) 'what you don't want' (Matthews & Yip 1994:113). The values of C constructing NP can vary in these np{C, X} structures, as can the values of X. There are language-particular conventions for the precise set of constructing categories (nominalizing particles, classifiers, definite articles, etc) and for the different values of X (adjective, adverb, infinitival VP, S, etc) that can combine with the relevant C to yield a noun phrase. But the very possibility and cross-linguistic productivity of omitting the 13 noun/pronoun/name and of still having the phrase recognized as NP, in so-called 'nominalizations' and in the other structures illustrated here, follows from the Constructability Hypothesis in (11). A further prediction made by (11) is relevant for those languages whose lexical items are highly ambiguous with respect to syntactic category, even for the major parts of speech like noun and verb. The Polynesian languages are often discussed in this context (see e.g. Broschart 1997, Hengeveld et al. 2004). So is Cayuga (Sasse 1988). English has a large number of words that are ambiguous between noun and verb and there are many minimal pairs such as they want to run/they want the run and to play is fun/the play is fun. The article constructs NP here and disambiguates between N and V. Languages without a unique class of nouns do not have lexical categories that can unambiguously construct NP on each occasion of use. If lexical predicates are vague as to syntactic category, then projection to NP is not guaranteed by lexical entries and the Constructability Hypothesis (11) is not satisfied. (14) Prediction 2: Lexical Differentiation Languages in which nouns are differentiated in the lexicon from other categories (verbs, adjectives or adverbs) can construct NP from nouns alone. Languages without a unique class of nouns in the lexicon will make use of constructing particles in order to construct NP and disambiguate the head noun from other categories; such particles are not required (though they are not ruled out) in languages with lexically differentiated nouns. Relevant data come from the Polynesian languages, which make extensive and obligatory use of NP-constructing particles such as "definite" articles, extending their meanings into the 14 arena of indefiniteness, see Lyons (1999:57-60). Samoan le, Maori te and Tongan e appear to be best analyzed as general NP constructors: they convert vague/ambiguous predicates into nouns within the NP constructed. Other (tense and aspect) particles construct a clause (IP) or VP and convert ambiguous lexical predicates into verbs (Broschart 1997). We have here a plausible motivation for the expanded grammaticalization of definite articles and other particles in these languages (see Hawkins 2004:82-92 for detailed discussion).[4] 3.2 VO versus OV Asymmetries VO languages have predominantly head-initial phrases that permit early construction of these phrases in parsing, by projection from the respective heads (V projects to VP, N to NP, P to PP, etc). OV languages have predominantly head-final phrases that favor late construction. I have argued (Hawkins 1994, 2001, 2004) that consistent head ordering minimizes processing domains for phrase structure recognition by shortening the distances between heads and that this provides an explanation for the existence and productivity of these two major language types across the world, head-initial and head-final.[5] There is, however, an interesting asymmetry between them that can be seen in so-called non-lexical or functional head categories that can be linked to considerations of processing. Consider first the combination of a verb with a PP sister within VP, i.e. phrases such as vp[went pp[to the movies]] in English. There are four logical possibilities for the ordering of V, the lexical head of VP, and P, the lexical head of PP, shown in (15): (15) a. vp[went pp[to the movies]] --------c. vp[went [the movies to]pp] ------------------- b. [[the movies to]pp went]vp --------d. [pp[to the movies] went]vp ------------------- 15 (15a) is the English order, (15b) is the Japanese order, and these two sequences with adjacent lexical heads (V and P) guarantee the smallest possible strings of words for the recognition of VP and its immediate constituents (see the underlinings). They are also highly preferred by approximately 94% to a combined 6% for the inconsistently ordered heads of (15c) and (d) in the Hawkins (1983, 1994, 2004) and Dryer (1992) samples. An additional non-lexical category C within NP that can construct NP, in addition to N, can be efficient in VO languages. Either np[N ...] or np[C ...] orders can construct NP immediately on its left periphery and provide minimal “phrasal combination domains” and “lexical domains” linking e.g. V and NP within a VP (cf. note 5). (16) vp[V np[N ...] vp[V np[C ... N ...] ------ We expect additional constructor categories C to be productive in VO and head-initial languages, therefore, and to be especially favored when N itself is not initial in NP, e.g. in np[C AdjP N]. The determiner position of English exemplifies this, with left-peripheral articles constructing NP in advance of N. A German structure like die von dem Bauer geschlachtete Kuh (the by the farmer slaughtered cow, i.e. 'the cow slaughtered by the farmer') provides an extreme example of a left-peripheral constructor of NP in advance of N, since the intervening participial phrase can be quite complex (Weber 1970). Additional constructing categories in OV and head-final languages, on the other hand, do not have comparable benefits. They lengthen phrasal combination domains and other processing domains linking NP to V when NP precedes, whether the additional constructor precedes or follows N: 16 (16) [[... N ... C]np V]vp [[... C ... N]np V]vp ------------ Additional constructors of NP can be inefficient in OV orders, therefore, and are predicted to be significantly less productive than their head-initial counterparts as a consequence.[6] (17) Prediction 3: VO versus OV asymmetries Constructors of NP other than N, Pro and Name, such as articles, are efficient for NP construction in VO languages and should occur frequently; they are not efficient for this purpose in OV languages and should occur less frequently. We can test this using the World Atlas of Language Structures (Haspelmath et al. 2005). WALS provides data on languages that have definite articles as a separate category from demonstrative determiners (from which definite articles have generally evolved historically, cf. Himmelmann 1997, Lyons 1999). If, as argued in Hawkins (2004:82-93), it is processing efficiency that drives the grammaticalization of definite articles out of demonstratives, then we expect to see a skewing in the distribution of definite articles in favor of head-initial languages. The figures in (18) show that VO languages do indeed have significantly more definite articles than OV languages. We also expect that non-rigid OVX languages should have more definite articles than OV languages with rigid verb-final orders, since OVX languages have more head-initial phrases in their grammars, including headinitial NPs (Hawkins 1983), in which early construction of NP can be an advantage. This prediction is also borne out. The figures in parentheses refer to Dryer's "genera".[7] (18) Rigid OV Def word distinct from Dem 19% (6) No definite article 81% (26) 17 VO 58% (62) 42% (44) Non-rigid OVX 54% (7) 46% (6) By similar reasoning separate words for constructing subordinate clauses, such as complementizers, should be more frequent in VO than in OV languages. Verbs construct VP, and finite or agreement-marked verbs project to a clause or IP (Hawkins 1994:ch.6). Complementizers can precede the verb in VO languages, shortening phrasal combination domains for matrix sentence (S and VP) processing in sentences such as I believe [that John ate the sandwich] (the words relevant for matrix clause processing are shown in bold). But whether the complementizer in an OV language occurs initially (in sentences corresponding to I [that John the sandwich ate] believe and [that John the sandwich ate] I believe) or finally (I [John the sandwich ate that] believe and [John the sandwich ate that] I believe) there will be longer phrasal combination domains compared with VO languages. When the complementizer is initial it constructs the subordinate clause before the verb, and when it is final the verb will generally construct the subordinate clause before the complementizer. Either way there will be longer matrix processing domains. According to Dryer (1992, 2007) separate complementizer words are indeed significantly more common in VO languages than in OV, and their initial positioning in VO languages is supported exceptionlessly, as shown in (19). (Again, genera are given in parentheses.) (19) Complementizer Words (% of total lgs with complementizers) OV VO Final 14% (27) Initial 12% (22) Final 0% Initial 74% (140) (0) 18 4. The Attachability Hypothesis, its Predictions and Typological Patterns Corresponding to the Constructability Hypothesis in (11) I propose (20): (20) The Attachability Hypothesis For each phrasal node P, all daughter categories {A, B, C, ...} must be attachable to P. The degree of syntactic, morpho-syntactic or lexical encoding that facilitates attachability will be in proportion to the processing complexity and/or efficiency of making the attachment. In other words, all daughters must be attachable, and the more difficult the attachment is, the more grammatical or lexical information is required to bring it about. The use of explicit attachment devices under conditions of difficulty, and their possible omission when processing is easy, is efficient: activation of processing resources and greater effort are reserved for conditions under which they are most useful. This is supported by a large range of grammatical and performance data that motivate the principle of Minimize Forms in Hawkins (2004:38-48): Form minimizations apply in proportion to the ease with which a given property P can be assigned in processing to a given form F. Rohdenburg's (1996, 1999) complexity principle provides further supporting data from English corpora: "In the case of more or less explicit grammatical options, the more explicit one(s) will be preferred in cognitively more complex environments" (Rohdenburg 1999:101). For attachments to NP, (20) leads to the hypothesis in (21): (21) NP Attachment Hypothesis Any daughters {A, B, C, ...} of NP must be attachable to it on each occasion of use, through syntactic, morpho-syntactic or lexical encoding on one or more daughters, 19 whose explicitness and differentiation are in proportion to the processing complexity and/or efficiency of making the attachment. In sections 4.1 - 4.5 I define and test some predictions made by (21). 4.1 Separation of NP Sisters One clear factor that increases the difficulty of attaching constituents together as sisters is separation from one another. (22) Prediction 4: Separation of Sisters Morpho-syntactic encoding of NP Attachment will be in proportion to the degree of separation between sisters: the more distance, the more encoding. Consider first some performance data from English involving relative clauses with explicit relativizers (who, whom, which, and that) versus zero. The relativizers construct a relative clause. Their presence can also help to attach the relative to the head, especially when there is animacy agreement between relativizer and head noun (the professor who ..., etc), but also in the absence of agreement in animacy (since relatives are known to attach to head nouns by Phrase Structure rules). Empirically, it turns out that the presence of the relativizer and the avoidance of zero is directly proportional to the distance between the relative clause and the head noun. The figures in (23) are taken from Quirk's (1957) corpus of spoken British English. They show that the use of explicit relativizers increases significantly, from 60% to 94%, when there is any separation between nominal head and relative. (23) a. Restrictive (non-subject) relatives adjacent to the head noun explicit relativizer = 60% (327) zero = 40% (222) b. Restrictive (non-subject) relatives separated from the head noun explicit relativizer = 94% (58) zero = 6% (4) 20 The figures in (24) measure the impact on relativizer retention resulting from larger versus smaller structural separations and are taken from the Brown corpus (collected by Barbara Lohse , cf. Lohse 2000). (24) a. Separated relatives in NP-internal position which/that = 72% (142) zero = 28% (54) b. Separated relatives in NP-external position (i.e. extraposed) which/that = 94% (17) zero = 6% (1) Relatives in (24b) have been completely extracted out of NP (in structures corresponding to buildings will never fall down which we have constructed). In (24a) they remain NP-internal but still separated (e.g. by an intervening PP, buildings in New York which we have constructed). There is a significant increase from 72% to 94% in relativizer retention when the separated relatives are extraposed. These data support prediction 4. Consider now some data from grammars involving explicit case marking. In languages that employ case copying as an attachment strategy (see section 2.2) we predict a possible asymmetry whereby explicit case marking can be retained on separated, but not on adjacent, sisters. Warlpiri exemplifies this (Blake 1987). Contrast the Warlpiri pair (25) with Kalkatungu (6), repeated here: (25) a. np[tyarntu wiri-ngki]+tyu yarlki-rnu dog big-ERG+me (Warlpiri) bite-PAST b. npi[tyarntu-ngku]+tyu yarlku-rnu npi[wiri-ngki] dog-ERG+me bite-PAST big-ERG yaun-tu] npj[yanyi] itya-mi 'The big dog bit me.' (6) a. npi[thuku-yu (Kalkatungu) 21 dog-ERG big-ERG white-man bite-FUT 'The big dog will bite the white man' b. npi[thuku-yu] npj[yanyi] dog-ERG itya-mi npi[yaun-tu] white-man bite-FUT big-ERG Case copying in Kalkatungu occurs on every word of the NP, whether adjacent or not. Warlpiri case copying occurs only when NP sisters are separated (25b). When NP constituents are adjacent (25a) the ergative case marking occurs just once in the NP and is not copied. This pair of Australian languages illustrates the asymmetry underlying Moravcsik's (1995:471) implicational universal in (26): (26) Moravcsik's Universal If agreement through case copying applies to NP constituents that are adjacent, it applies to those that are non-adjacent. In other words, agreement is found under adjacency and non-adjacency, but it can be absent from adjacency at the same time that it occurs in non-adjacent environments. What is ruled out is the opposite asymmetry: agreement when adjacent and not when non-adjacent. Since agreement is a type of attachment marking we see, correspondingly, that the explicit encoding of attachment in performance and grammars is found under both adjacency ((23a) and (6a)) and non-adjacency ((23b), (25b) and (6b)). Zero coding is preferred when there is adjacency and is increasingly dispreferred when there is not (compare (23a) with (23b) in performance and (25a) with (25b) in grammars). What is not found is the opposite of the English relativizer pattern and of Warlpiri case coding: explicit attachment coding under adjacency and zero coding for separated items. 22 An example of case copying in a nominative-accusative language comes from Hualaga Quechua, as discussed in Plank (1995:43) and Koptjevskaja-Tamm (2003:645). When a possessor phrase is separated from its possessed head, as in (27), the accusative case marker -ta appropriate for the whole NP is added to genitive case-marked Hwan-pa. (27) Hipash-nin-ta kuya-: Hwan-pa-ta daughter-3POSS-ACC love-1 Juan-GEN-ACC 'I love Juan's daughter' 4.2 Ambiguous attachment sites A second factor that adds to the processing load of making a correct NP attachment is the availability of alternative sites for attachment and of structural ambiguity: (28) Prediction 5: Ambiguous Attachments Morpho-syntactic encoding of NP Attachment will be in proportion to the availability of alternative containing phrasal nodes for the attachment of NP constituents: the more attachment sites, the more encoding. Consider some data from Modern Greek. The adjective normally precedes the noun in Greek, but it can also follow. When it does so a second definite article is required in order to signal attachment of the adjective to NP, as shown in (29a). (29b), without the second article, has the syntax and semantics of a predicate adjective within a secondary predication (Joseph & Philippaki-Warburton 1987:51): (29) a. Mu arésun i fústes i kondés Me-GEN please-3PL DEF skirts-FEM+PL DEF short-FEM+PL 'I like the short skirts' b. Mu arésun i fústes kondés 23 'I like the skirts short' (i.e. 'I like them to be short') This minimal pair in Greek reveals the role that definiteness marking can play in signaling syntactic attachment to NP, in addition to its construction role (cf. section 2.1), and in addition to its pragmatic functions (Lyons 1999). It also gives us an important glimpse into the origins of agreement affixation in languages like Arabic, where the affixes are derived from definiteness markers and are copied on noun phrase daughters. Illustrative examples from Arabic and other languages are given in (30): (30) a. Arabic has a definite prefix on adjectives in definite NPs: al-bustān-u l-kabīr-u (DEF-garden-NOM DEF-big-NOM), 'the big garden' (Lyons 1999:91). b. Agreement affixes on Albanian adjectives derive historically from the definite article: i mir-i djalë (DEF good-AGR boy), 'the good boy' (Lyons 1999:79). c. Lithuanian and Latvian have definite adjective declensions that are the product of an affixed demonstrative stem with 'j', while Serbo-Croat and Slovenian show relics of a system of similar origin (Lyons 1999:82-84). Further example of definiteness marking for attachment purposes can be seen in languages like Rumanian. NPs in combination with a preposition often omit the (affixed) definite article when the NP consists of N alone, but keep it when NP consists of two or more ICs, e.g. N Adj, N Rel, and N Adj Rel (Mallinson 1986:55, Himmelmann 1998): (31) a. intrat în casă [ǎ = schwa] entered in house, i.e. 'entered the house' b. intrat în casa mare entered in house-DEF big, i.e. 'entered the big house' 4.3 Frequency of NP Attachments 24 A further factor that facilitates attachment of a category to an NP that has been constructed in on-line processing is the frequency with which that category normally occurs NP-attached. (32) Prediction 6: Frequency of NP Attachments Morpho-syntactic encoding of the attachment of X to an NP that has already been constructed by some Y in on-line processing will be in proportion to the frequency with which X occurs NP-attached: the less frequent X‟s attachment, the more encoding, and vice versa. Haspelmath (1999:234-5) has discussed relevant data involving the occurrence versus nonoccurrence of definite articles in NPs containing possessives. Grammatical rules are sensitive to the relative ordering in which the possessor and the possessed head noun occur, and this ordering can be linked in the account given here to the frequency with which the category that follows (X) occurs attached to the one that precedes (Y). In several languages (including English, Spanish, Swedish, Rumanian and Albanian) a preposed possessor rules out an accompanying article, whether the article normally comes before the noun (33a) or after it (33b): (33) a. English our dog's (*the) kennel; Spanish (*el) mi libro, (DEF) my book b. Swedish min vän(*nen), my friend(DEF); Albanian im vëlla(*-i), my brother(DEF) But a postposed possessor in these languages does not rule out a definite article: (34)a. English the kennel of our dog; Spanish el libro mío, the book my, b. Swedish vänn-en min, friend-DEF my; Albanian vëlla-i im, brother-DEF my The asymmetry here is between Poss N structures, in which articles are dispreferred, versus Art N Poss and N Art Poss. 25 Frequency of NP Attachments provides a possible explanation. In the Poss N order either a possessive determiner such as my or a possessive phrase morpheme such as -s constructs NP (by Mother Node Construction or Grandmother Node Construction, Hawkins 1994:ch.6). A following N can be readily linked to the NP so constructed because N requires a mother NP and co-occurs frequently with determiners and other modifiers within NP. But in the reverse order, N Poss, either N or Art will construct NP on the left periphery and a following possessor will not be so readily attachable to this NP. For example, Swedish min is a pronoun as well as a so-called possessive adjective, and pronouns typically construct NPs on their own and do not normally co-occur with accompanying modifiers. Hence, a min following vänn can benefit from explicit attachment marking in the form of a definite article (vänn-en min) in order to signal that a normally freestanding pronominal element which constitutes NP on its own is actually an immediate constituent of the NP already constructed by the noun vänn. A similar account can be given for the Spanish mío in postnominal position (el libro mío). For phrasal possessors such as our dog's kennel we might appeal to the fact that an N following PossP can readily attach to the NP constructed by -s (making the article unnecessary, our dog's (*the) kennel), whereas prepositional phrase possessors in post-nominal position (the kennel of our dog) are not unique to NP (being productive complements of adjectives, aware of our dog, and verbs, think of our dog, etc) and can therefore benefit from explicit attachment marking in the form of the definite article. The basic generalization here is that a following N can be readily incorporated into an NP that has already been constructed on-line, whereas pronouns and other categories following N can benefit from attachment marking. For pronouns this is plausibly because 26 they resist attachment to an NP other than the one they themselves construct. I.e. they are only rarely attached to an NP that has already been constructed. PPs and certain other categories sometimes attach to NP and sometimes attach to other phrasal nodes. A noun, by contrast, is always NP-dominated and (in contrast to pronouns) combines highly frequently with other NP-dominated constituents. The occurrence of the definite article in these data is in inverse proportion to the frequency with which a following category X occurs within an NP already constructed by Y in on-line processing: less frequency results in more explicit encoding of attachment by the definite article. What differentiates them is the order of N relative to the possessor. Why should articles be dispreferred in the Poss N order? I suggest that attachability to NP provides an explanation. In the Poss N order either a possessive determiner such as my or a possessive phrase morpheme such as -s constructs NP (by Mother Node Construction or Grandmother Node Construction respectively, cf. Hawkins 1994:ch.6). A following N can be readily linked to the NP so constructed because N requires a mother NP and co-occurs productively with determiners and other modifiers within NP, as formulated in the Phrase Structure rules of the grammar. But in the reverse order, N Poss, either N or Art will construct NP on the left periphery and a following possessor will not be so readily attachable to this NP.[8] This line of explanation receives further support from a parallel asymmetry involving definite articles and demonstratives, which Haspelmath (1999) points out in his note 9 (p.235). There are several languages in which the order Dem N rules out an accompanying article, whereas N Dem permits one. Compare Spanish este libro ('this book') with el libro este ('the book this'), cf. Brizuela (1999). Once again, the noun libro is readily attachable to an NP that has already been constructed by a preceding este, which is a pronoun and also a 27 demonstrative determiner. But when este follows libro its attachment to the NP constructed by this latter is facilitated by explicit attachment marking in the form of the definite article el. Yet further support comes from an altogether different language and family, Maltese. Adjectives normally follow nouns in Maltese, and when they do so the definiteness prefix is often repeated in its appropriate allomorphic form (Plank & Moravcsik 1996:187-9): il-mare (t-)twila (DEF-woman (DEF)-tall, i.e. 'the tall woman'). When the adjective precedes the noun, however, only the adjective takes definiteness marking: il-famuz (*is-)strajk (DEFfamous (DEF-)strike, i.e. 'the famous strike'). In other words, N Adj order permits repeated definiteness marking on Adj, Adj N order does not permit repeated marking on N. I suggest that a noun following an adjective can be readily attached to an NP that has been constructed (through Grandmother Node Construction) by a definiteness prefix on the adjective (cf. ilfamuz). But an adjective following a noun can benefit from this additional definiteness marking on the adjective itself (il-mare t-twila) in order to signal the attachment to NP. 4.4 Lexical Differentiation and Word Order Languages with lexical specialization for parts of speech, such as adjective, can provide clear attachments to NP in many grammatical environments when Phrase Structure rules plus the lexicon are accessed in parsing. I.e. lexical specialization plus a grammar can often guarantee unambiguous attachment to NP. Languages without such specialization must rely on either morpho-syntactic particles devices (see section 4.1) or on fixed word order. In (35) I formulate a prediction that can be made for fixed word order on the basis of the NP Attachment Hypothesis in (21). (35) Prediction 7: Lexical Differentiation and Word Order 28 Lexical specialization for the category Adjective will permit the relevant languages to order the Adjective before or after the Noun, attachment to NP being guaranteed by this part of speech plus Phrase Structure rules; lack of such specialization will favor fixed word order, with consistent attachments to a leftward nominal head (VO lgs) or to a rightward nominal head (OV lgs). Hengeveld et al. (2004) have shown that a lack of lexical differentiation for basic parts of speech correlates with more fixed and typologically consistent word orders across phrasal categories. The NP Attachment Hypothesis provides a reason why. They distinguish, inter alia, between languages that have a separate category of NP-dominated adjectives, which can unambiguously attach to NP, versus those that do not. The former (exemplified by English and Wambon, types 4-5 on the Hengeveld et al. Part of Speech hierarchy) all have separate nouns, verbs and adjectives. The latter (exemplified by Samoan, Warao and Ngiti, types 1-3 for Hengeveld et al.) have no separate adjectives. They may or may not have separate nouns and verbs either, depending on their position on the Hengeveld et al. hierarchy Consider Basque, an OV language which has a separate class of adjectives ordered inconsistently after the noun, while adverbial modifiers of the verb precede the verb (Saltarelli 1988). In the absence of lexical (or morpho-syntactic) differentiation between Adj and Adv, a non-head modifier that followed N and preceded V would be regularly ambiguous as to its attachment site, to the left or to the right: (36) N Adj/Adv V. [Head-Modifier in NP within SOV] Using English morphemes, a grammatical distinction between loud (adjective) and loudly (adverb) can make clear the intended attachments in music loud played (attach loud to music 29 within NP) versus music loudly played (attach loudly to played within VP). Alternatively, a consistently ordered adjective in an SOV language would avoid this attachment ambiguity: (36') Adj N Adv V [Modifier-Head in NP within SOV] Conversely, a VO language with Modifier Head ordering in the NP but with postverbal adverbial modification would invite similar attachment ambiguities in the absence of lexical differentiation between play loud music and play loudly music: (37) V Adv/Adj N [Modifier-Head in NP within VO] A consistently ordered adjective would avoid them: (37') V Adv N Adj [Head-Modifier in NP within VO] In VO (head-initial) languages, non-head categories can be consistently attached to heads on their left, therefore, and in OV (head-final) languages they can be consistently attached to the right. Languages with lexically differentiated categories, on the other hand, can tolerate ordering inconsistency when the lexicon supplies a clear class of adjectives that are known to attach to NP in relevant environments. The precise predictions that we can make on the basis of (35) are complicated by the fact that category differentiation in the lexicon plus word order is only one grammatical means for solving attachment problems, morpho-syntactic linking of different kinds being another (see section 3.2), and also (in spoken language) considerations of prosody and intonation (see e.g. Kiaer 2007). Nonetheless, we expect any one attachment device to be more productive in certain language types and structures than in others, namely in those for which the absence of any attachment device at all would be problematic for NP Attachment (21). For lexical differentiation we can reasonably make the following predictions, therefore: 30 (38) a. Lexically undifferentiated languages without a productive Adj category (Hengeveld et al.'s types 1-3) and with basic SOV will favor consistent MH order in NP. b. Such languages with basic VO (VSO or SVO) will favor consistent HM order in NP. (39) a. Lexically differentiated languages with a productive Adj category (Hengeveld et al.'s types 4-5) and with basic SOV will permit inconsistent HM order in NP, either as a basic order or as a frequent variant. b. Such languages with basic VO (VSO or SOV) will permit inconsistent MH order in NP, either as a basic order or as a frequent variant. The relevant language quantities, taken from Hengeveld et al.'s Table 4 (p.549), are as follows: (38') a. 5/6 SOV languages described in (38a) have consistent MH order in NP (Mundari)[9] b. 3/4 VO languages described in (38b) have consistent HM order in NP (Samoan)[10] (39') a. 10/13 SOV languages described in (39a) permit inconsistent HM orders in NP (Basque)[11] b. 4/8 VO languages described in (39b) permit inconsistent MH orders in NP (Arapesh)[12] In other words, the languages predicted to be consistent generally are so, and a significant number of the languages predicted to permit inconsistency do so. 4.5 Minimize NP Attachment Encoding A further prediction that can be made on the basis of the NP Attachment Hypothesis is (40): (40) Prediction 8: Minimize NP Attachment Encoding 31 The explicit encoding of attachment to NP will be in inverse proportion to the availability of other (morpho-syntactic, syntactic and semantic-pragmatic) cues to attachment: the more such cues, the less encoding. In other words, we predict less explicit attachment marking when there are other cues to attachment. Consider in this regard Haspelmath's (1999:235) universal regarding the omissibility of definite articles in NPs with possessors depending on the type of possession relation, rather than on the ordering of the head noun (as discussed in section 4.3) (41) Haspelmath's Universal If the definite article occurs with a noun that is inherently related to an accompanying possessor, such as a kinship term, then it occurs with nouns that are not so inherently related. I suggest that this universal can be seen as a consequence of the attachment function of the definite article, linking a possessor to a head noun. Kinship involves necessary and inalienable relations between referents, which makes explicit signaling of the attachment less necessary with nouns of this subtype. The definite article can attach a possessor to a head noun in Bulgarian, Nkore-Kiga and Italian (42a), but not when the head noun + possessor describes a kinship relation like 'my mother' (42b), cf. Haspelmath (1999:236) and Koptevskaja-Tamm (2003): (42) a. Bulgarian kola-ta mi; Nkore-Kiga e-kitabo kyangye; Italian la mia casa car-DEF my DEF-book my DEF my house b. Bulgarian majka(*-ta) mi; Nkore-Kiga (*o-)mukuru wangye; Italian (*la) mia madre mother(-DEF) my (DEF-)sister my (DEF) my mother 32 Support for this attachment explanation comes from the fact that other attachment devices (see section 2.2) show a parallel sensitivity to inalienable possession, suggesting that omissibility is not a consequence of the semantics and pragmatics of definiteness as such in combination with inalienable possession, as in Haspelmath's account. The Cantonese nominalizer/attachment marker ge can be omitted as an explicit signal of attachment for possessor + noun when there is an inalienable bond between them, like kinship, and especially when the possessor is a pronoun. Contrast ngóh sailóu (I younger-brother, i.e. 'my younger brother') with gaausauh ge baahngūngsāt (professor NOMLZ/ATTACH office, i.e. 'the professor's office'), cf. Matthews & Yip (1994:107). A particularly subtle test of the basic idea behind prediction 8 (40) has been made on Zoogocho Zapotec data by Sonnenschein (2005:98-110). There are different formal means for marking possession in this language, by simple adjacency of nouns (43a), by a possessive prefix (43b) and by a postnominal possessor phrase headed by che (of) (43c): (43) a. tao lalo (Zoogocho Zapotec) grandmother Lalo, i.e. 'Lalo's grandmother' b. x-kuzh-a' POSS-pig-1SG, i.e. 'my pig' c. tigr che-be' tiger of-3INFORMAL, i.e. 'her tiger' Sonnenschein tests the idea that there is a continuum from inalienable possession at the one end ('my head', etc) through frequently possessed items (like 'her pig') to not very frequently possessed items (like 'her tiger'). He shows on the basis of a corpus study that the amount of formal marking for possession correlates inversely with the frequency with which the 33 relevant head nouns are in a semantic possession relation. Possession signaled by simple adjacency (43a) is used for head nouns that are always possessed (like kinship terms and body parts). Possession signaled syntactically by a postnominal possessor phrase (43c) is used with head nouns that are generally unpossessed. And NPs that show either morphological x- (43b) or syntactic encoding (43c) are more variably possessed. This intermediate group also shows a preference for the morphological variant when the possession is more inherent, and for the syntactic variant when the possession is less inherent, for example when a possessed house is under construction and the owners are not yet living in it. Sonnenschein's quantification of the degree and frequency of possession correlating inversely with both the presence versus absence of possession marking and with its amount and complexity supports the role of additional semantic-pragmatic cues in signaling the attachment of possessor to possessed, resulting in form minimization. Consider finally in this section a detail from Maltese. Plank & Moravcsik (1996:192) point out that the definite article is not used with nouns in the construct state, despite the definiteness of the relevant NPs. In other words, it is not used when nouns are followed by "a nominal attributive not marked by a preposition", as in leħen Manwel (voice Manwel, i.e. Manwel's voice); compare leħen l-avukat (voice DEF-advocate, i.e. 'the advocate's voice'). I mentioned in section 2.2 that the construct state in Semitic is an attachment device that links sisters together. If this applies to Maltese as well, there would be no need for a second attachment marker in addition to the construct state, according to (34), which is what we get. 4.6 Significant Attachments 34 We have seen in sections 4.1 - 4.5 that structural attachments to NP that would be hard to process can be facilitated by various morpho-syntactic and syntactic devices, by fixed word order and by lexical differentiation. Notice now that explicit attachment devices are also preferred in structures in which the attachment is communicatively significant, for example those in which nominal modifiers are vital for referent identification. The following generalization does not follow from the NP Attachment Hypothesis as formulated in (21), but it appears to be a robust pattern that is further characteristic of attachment markers. Further research should explore more data of this sort to see whether a higher processing generalization can capture both the patterns predicted by (21) and these "significant" attachments at the same time: (44) Significant Attachments The explicit encoding of attachment is in proportion to the significance of making the attachment for referent identification purposes. For example, with proper names in English an accompanying relative clause takes a definite article when it is semantically restrictive, and not when it is appositive: the John who likes me versus John, who likes me. The former distinguishes one person named John from another, the latter does not, and it is the former that takes the definite article, which I would analyze here as an explicit marker for attaching the relative to the head. The explicit marking reflects the fact that this attachment is significant for referent identification. The same applies to adjective modifiers. Compare the nice John (as opposed to the less nice one) with nice John (only one person named John is under consideration). Similarly in Maltese Plank & Moravcsik (1996:191) point out that proper names that do not normally take the definite article will take one when accompanied by a restrictive 35 relative: il-Manwel li naf jien (DEF-Manwel who I-know I, 'The Manwel who I know'). For adjectives they point out (pp.187-8): "Where there is variation [in spoken and journalistic Maltese, JAH] it is essentially restrictive adjectives, making a significant contribution to the identifiability of the noun phrase's referent, which deserve a definite article of their own. Thus, in il-mara t-twila [DEF-woman DEF-tall, JAH] a contrast is likely to be implied to a woman that is not tall, while in il-mara twila the tallness of the woman is likely to be part of the addressee's advance knowledge." When nouns in English are accompanied by sentential complements, the fact that Arctic ice has disappeared at an alarming rate or the rumor that the Prime Minister is going to resign we also find definite articles, obligatory in the former case (*a fact that Arctic ice has disappeared ... is ungrammatical), optional in the latter (a rumor that the Prime Minister is going to resign is grammatical). Definiteness can be used in these structures in violation of the normal pragmatic rules governing familiarity and appropriate usage (cf. Hawkins 1978, 1991). The fact and the rumor in question may be quite unknown to the hearer and uninferrable prior to these utterances, and yet the definite article is appropriate. I suggest that the signals an important attachment to fact and rumor respectively: the hearer needs to consult the sentential complement in order to identify which fact and which rumor the speaker intends. We might extend this explanation to other cases in which there is a predicational relation between modifier and head, such as the name Algernon. Hearers may not know that "Algernon is a name" (just as they may not know the fact that Arctic ice has disappeared ...), cf. also the color ruby (ruby is a color), the number two (two is a number), etc. In all these cases the following name, noun or numeral serves to identify the referent of 36 the head noun, limiting it to a particular instance of the set of things that are names, colors and numbers, just as the following complement clause identifies the relevant fact and rumor. English also exhibits special "cataphoric" uses of the demonstrative determiner those with a following noun and relative clause: those students who pass the foreign language exam can gain admission to university. The students in question are only identifiable by reference to the content of the relative clause and the determiner draws explicit attention to the need to consult the attached clause. Simple definite articles can also perform this cataphoric function with relative clauses in NPs whose referents can be pragmatically unfamiliar, like Joe's fed up with the book he just got for his birthday (Hawkins 1978:131-8). The determiners signal the significance of the relative clause for referent identification in these examples, and they do so in structures for which normal pragmatic rules of appropriate usage do not, or need not, apply. Attachment marking needs to be recognized as a component in the description of the definite article in English, in addition to its pragmatic functions. Definite articles also construct English NPs on their left periphery, regularly minimizing syntactic processing domains. Syntactic and semantic processing functions are an important part of the analysis of articles and determiners in English, therefore, even though pragmatic functions appear to be widespread and to subsume most uses. In many other languages, like Polynesian and Maltese, the pragmatic functions of articles are less clear because their construction and attachment functions are more extensive and cover a larger range of uses than in English. Construction and attachment are, nonetheless, an important part of the grammar of English determiners. 5. Conclusions 37 I have argued that a whole myriad of grammatical details across languages can be profitably viewed from a processing perspective. Two hypotheses have been proposed involving Constructability (11) and Attachability (20), from which eight predictions for typological patterns have been derived: for NP Construction in (12), Lexical Differentiation (14), VO versus OV Asymmetries (17), Separation of Sisters (22), Ambiguous Attachments (28), Frequency of NP Attachments (32), Lexical Differentiation and Word Order (35), and Minimize NP Attachment Encoding (40). These predictions have been illustrated with sample languages and with quantitative data where these are available. The variation patterns we have seen, the presence versus absence of morpho-syntactic devices in different environments, the existence of different degrees of lexical differentiation for parts of speech correlating with word order patterns, the exceptions to normal grammatical or semantic/pragmatic rules in certain structures, and the asymmetries between different language types, are largely mysterious when viewed from a grammatical perspective alone. In order to describe the facts, we need the best models of syntax available and precise processing operations defined in terms of them. But it is these latter that help clarify why and how grammars make use of the various devices summarized in section 2 and why different languages exhibit the cross-linguistic variation patterns we have seen in sections 3-4. They all follow from two basic processing needs: anything that is an NP must be recognized as such, i.e. NP has be constructable; and all the items that belong to NP must be attachable to it. I have tried to show that these two simple ideas have numerous grammatical consequences and can make sense of a lot of the variation patterns that typologists and formal grammarians have puzzled over. Grammars appear to have conventionalized the preferences of performance that are evident in languages with structural 38 choices between e.g. the presence or absence of a relative pronoun, of an article or a classifier. This Performance-Grammar Correspondence Hypothesis (1) motivates the "processing typology" research program of Hawkins (1994) and (2004). For linguists the inclusion of processing in the very core of their theorizing about grammars can provide benefits of the kind I have illustrated here. For psychologists, exposure to more linguistic diversity can lead to refinements in processing ideas derived from the more familiar languages. Data from less familiar languages sometimes challenge assumptions that are inherent in current models.[13] There are countless cross-linguistic details that I could not mention in this paper, for reasons of space, some of which can be readily linked to the predictions made here, others of which remain mysterious to me. My purpose in writing the paper is to encourage others to consider grammars from this point of view. Even very familiar words in the best described languages, like the definite article in English, can benefit, I would argue, from a reanalysis along the lines suggested here. UC Davis and Cambridge University Correspondence addresses: Department of Linguistics, UC Davis, 208 Sproul Hall, One Shields Avenue, Davis, CA 95616, USA; and Research Centre for English and Applied Linguistics, University of Cambridge, 9 West Road, Cambridge, CB3 9DP, UK; e-mails: [email protected], [email protected] Acknowledgements: Abbreviations: ABL = ablative case; ACC = accusative case; ADJ = adjective; ADV = adverb; AGR = agreement marker; ART = article; ATTACH = attachment marker; CL = 39 classifier; CONSTR = construct state; DEF = definite article or particle; DEM = demonstrative determiner or pronoun; EIC = Early Immediate Constituents; ERG = ergative case; FEM = feminine; FUT = future; GEN = genitive case; HM = HeadModifier order; IC = immediate constituent; II = second declension; IP = inflection phrase (or clause); M = mother node; MH = Modifier-Head order; MiD = Minimize Domains; N = noun; NEUT = neuter; NOM = nominative case; NOMLZ = nominalizing particle; NP = noun phrase; OV = object verb order; P = preposition or postposition; PART = particle; PCD = Phrasal Combination Domain; PGCH = Performance-Grammar Correspondence Hypothesis; PL = plural; PoS = part of speech; POSS = possessor; PossP = Possessor Phrase; PP = prepositional or postpositional phrase; REL = relative clause; S = sentence; SG = singular; SOV = subject object verb order; SVO = subject verb object order; V = verb; VO = verb object order; VP = verb phrase; VSO = verb subject object order; WALS = World Atlas of Language Structures. Footnotes 1. For theories in which Determiner Phrase and NP are distinguished the present paper can be viewed as providing a processing perspective on NP and DP structure. A number of the details will differ from the account proposed here, regarding which of these maximal projections is actually constructed by particular daughters and regarding the attachments to each, but the same processing logic can carry over to structural analyses incorporating DPs. 2. Some other imaginable possibilities for constructing phrasal nodes, such as from a sister node, are discussed in Hawkins (1994:360-1). 40 3. There are numerous differences between different formal models of grammar with respect to the precise set of heads they define, and numerous disagreements exist with respect to particular categories, cf. Dryer (1992) and Corbett et al., eds. (1993) for detailed summaries and discussion. Hawkins (1993, 1994) argues that the disputed categories generally have a "construction" function in parsing (whence the plausability of considering them heads at all), and that it is this that ultimately motivates the whole notion of "head of phrase" and its correlating properties. Individual grammatical models differ, essentially, in their stipulations over how closely they want grammars to be aligned with processing functions. So, for example, it is not required for processing that there should be a bi-unique relationship between a constructor C and the phrase P that it constructs. It is sufficient that C alone should guarantee P uniquely, whether or not some other category C' can also construct P. Putting this in grammatical terms: can a phrase have more than one head? Many grammatical models insist on biuniqueness, whereas others (those that are more closely aligned with parsing on this occasion) do not. 4. One way to test the proposed link between NP-constructing particles and lexical differentiation would be to compare languages with and without lexically unique nouns by selecting various subsets of lexical predicates, quantifying numbers of categoryambiguous items (i.e. predicates like run and play in English, as opposed to student and professor, which are uniquely nouns), numbers of syntactic environments that require the definite article or other NP constructor, and corpus frequencies for these constructors. Hengeveld et al. (2004) provide a useful typology of lexical differentiation across languages 41 and a language sample and I shall make use of their data in section 4.4 below when testing a related prediction involving word order and attachment. 5. The basic efficiency principle to which I appeal in this section is Minimize Domains (Hawkins 2004:31), defined as follows: (i) Minimize Domains (MiD) The human processor prefers to minimize the connected sequences of linguistic forms and their conventionally associated syntactic and semantic properties in which relations of combination and/or dependency are processed. The degree of this preference is proportional to the number of relations whose domains can be minimized in competing sequences or structures, and to the extent of the minimization difference in each domain. MiD predicts that "phrasal combination domains" should be as short as possible, and that the degree of this preference should be proportional to the minimization difference between competing orderings. This principle (a particular instance of Minimize Domains) was called Early Immediate Constituents (EIC) in Hawkins (1994): (ii) Phrasal Combination Domain (PCD) [Hawkins 2004:107] The PCD for a mother node M and its I(mmediate) C(onstituent)s consists of the smallest string of terminal elements (plus all M-dominated non-terminals over the terminals) on the basis of which the processor can construct M and its ICs. (iii) Early Immediate Constituents (EIC) [Hawkins 1994:69-83] The human processor prefers linear orders that minimize PCDs (by maximizing their IC-to-word ratios), in proportion to the minimization difference between competing orders. 42 Empirical support for EIC and for MiD is summarized in Hawkins (1994, 2004) using both corpora from numerous language types and psycholinguistic experiments. Additional corpus and experimental results providing broad support for EIC's/MiD's predictions are presented, for English in Wasow (1997, 2002), Stallings (1998), Stallings et al. (1998) and Lohse et al. (2004), for Japanese in Yamashita (2002) and Yamashita & Chang (2001), for Cantonese in Matthews & Yeung (2001), and for German in Uszkoreit et al. (1998). Hawkins' (2004) MiD is a more general version of the EIC principle for word order and of the structural complexity predictions for filler-gap structures defined in Hawkins (1994, 1999), applied now to all grammatical relations of combination and dependency. Gibson's (1998, 2000) "locality" principle is fundamentally similar in spirit to MiD and the considerable experimental support that Gibson offers for it carries over to MiD. 6. As shown in section 2.2 and as illustrated in greater detail in section 4, constructing categories like articles and classifiers can also signal the attachment of NP daughters to one and the same NP, and this could motivate the presence of C in an order such as np[... C ... N] even though phrasal combination domains were lengthened as a result. An order such as np[N ... C] could also signal the rightmost boundary of an NP in an inconsistent OV language with noun-initial NPs. Such additional processing motivations may explain why articles occur at all in (a minority of) rigid OV languages, as in the data of (18). 7. A genus for Dryer (1992) is a genetic grouping of languages comparable in time depth to the subfamilies of Indo-European. 8. The account proposed here is in the same processing spirit as Haspelmath's (1999) more pragmatically-based account, but differs from it in its 43 emphasis on syntactic co-occurrence frequencies for the categories X and Y in their respective orders. 9. The five SOV languages with basic and fixed MH order in NP are: Mundari, Hurrian, Quechua, Turkish and Ket (Warao being basic and fixed HM). 10. The three VO languages with basic and fixed HM in NP are: Samoan, Miao and Tidore (Tagalog having no basic order, i.e. MHM). 11. The ten SOV languages described in (39a) with inconsistent HM orders in NP are: Abkhaz, Alamblak, Bambara, Basque, Hittite, Koasati, Nasioi, Sumerian, Oromo and Wambon. Of these, four have maximum inconsistency with basic and fixed HM (Bambara, Koasati, Nasioi and Sumerian), four have basic HM with frequent departures in favor of the typologically consistent MH (Abkhaz, Basque, Nasioi and Sumerian), while two have no basic order (Hittite and Alamblak). The three SOV languages described in (39a) with consistent MH orders in NP are: Burushaski, Japanese and Nama. MH is both basic and fixed in the latter two, while MH is basic and free in Burushaski. 12. The four VO languages described in (39b) with inconsistent MH orders in NP are: Arapesh, Berbice Dutch, Pipil and Polish. Berbice Dutch and Pipil have basic MH (with fixed and free NP word orders respectively). Arapesh and Polish are classified as having no basic NP order (MHM). 13. 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