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Chapter 15 Neuropsychological Assessment Neuropsychological Assessment • Neurology: the branch of medicine that focuses on the nervous system and its disorders • Neuropsychology: the branch of psychology that focuses on the relationship between brain functioning and behavior – Formerly a specialty area within clinical psychology, has since emerged as a specialty in its own right 15-2 Neuropsychological Assessment • Neuropsychological assessment: the evaluation of brain and nervous system functioning as it relates to behavior – – – – pediatric neuropsychology geriatric neuropsychology forensic neuropsychology school neuropsychology • Neurotology: a branch of medicine that focuses on problems related to hearing, balance, and facial nerves 15-3 The Nervous System and Behavior: Quick Overview Nervous System is made up of: 1. Neurons: a nerve cell 2. Central nervous system: the brain and spinal cord 3. Peripheral nervous system: the neurons that convey messages to and from the rest of the body Note: Each of the cerebral hemispheres receives sensory information from the opposite side of the brain, and also controls motor responses on the opposite side of the body (contralateral control) 15-4 15-5 Neurological damage and organicity Brain damage: a general reference to any physical or functional impairment in the CNS that results in sensory, motor, cognitive, emotional, or related deficit Organicity: organic brain damage Note: There is a difference and these terms have been mistakenly used interchangeably 15-6 The Nervous System and Behavior How is neurological damage and organicity assessed? Researchers utilize a multitude of tools and procedures: MRI, fMRI, PET, CT imaging Electrical or chemical stimulation Surgical alteration Laboratory testing Field observation Autopsies 15-7 The Nervous System and Behavior How is neurological damage and organicity assessed? Lesion: a pathological alteration of tissue (e.g., that which could result from injury or infection) – This change can be focal or diffuse Lesions will manifest themselves in various behavioral deficits Neurological assessment can play a critical role in determining the extent of behavioral impairment that has occurred or can be expected to occur 15-8 The Neuropsychological Evaluation When is a neuropsychological evaluation indicated? In most cases a patient is referred to a psychologist for screening of suspected neurological problems A battery of tests will be conducted (most likely including an intelligence test, a personality test, and a perceptualmotor/memory test) If suspicious neurological signs are discovered the patient will be referred for a more detailed evaluation 15-9 15-10 The Neuropsychological Evaluation When is a neuropsychological evaluation indicated? The signs suggesting a more thorough evaluation are characterized by being “hard” or “soft”: Hard sign: an indicator of definite neurological deficit e.g., cranial nerve damage as indicated by neuroimaging Soft sign: an indicator that is merely suggestive of neurological deficit e.g., an apparent inability to accurately copy a stimulus figure when attempting to draw it 15-11 The Neuropsychological Evaluation When is a neuropsychological evaluation indicated? – Neurologists may refer their patients to neuropsychologists for further evaluation – A neuropsychologist may be called upon to assess the degree of a patient’s impairment in functioning 15-12 The Neuropsychological Evaluation General elements of a neuropsychological evaluation Objective:The objective of a neuropsychological evaluation is “to draw inferences about the structural and functional characteristics of a person’s brain by evaluating an individual’s behavior in defined stimulus-response situations” (Benton, 1994, p. 1) Method: How this is done involves a number of factors including the nature of the referral question, the capabilities of the patient, and the availability of records 15-13 The Neuropsychological Evaluation General elements of a neuropsychological evaluation Preparation includes ensuring the appropriate tools of assessment are employed Sometimes during the course of an evaluation, a deficit becomes known and changes the course of the assessment procedure Common to all evaluations are patient history, mental status exam, and administration of tests and procedures 15-14 The Neuropsychological Evaluation General elements of a neuropsychological evaluation The neuropsychologist employs knowledge of neuroanatomy, neurochemistry, and neurophysiology to interpret findings and employ tests Neuropsychologists must also be familiar with the effects of various prescription medications 15-15 The Neuropsychological Evaluation Patient history – Medical history of patient and immediate family – Developmental milestones – Psychosocial history (e.g., academic achievement, intelligence, adjustment, personality, thought processes, etc.) – Character, severity, and progress of any history of complaints involving disturbances in senses; muscle tone, strength, and control; autonomic functions; speech; etc. 15-16 15-17 The Neuropsychological Evaluation Patient history – Can shed light on whether the problem is origin of the problem as well as whether it is progressive (likely to spread or worsen) – May also reveal whether the patient’s presenting problem is a result of malingering rather than some deficit 15-18 The Neuropsychological Evaluation Interview – Structured interviews and rating forms can act as aids to neuropsychological screening and evaluation – Offers direction to further inquiry – e.g., Mini-Mental State Exam (MMSE) Neuropsychological mental status exam – Administered for the purpose of evaluating neuropsychological functioning 15-19 The Neuropsychological Evaluation Physical examination – A physical exam varies widely as a function of the expertise, competence, and confidence of the examiner – A physical exam looks at the examinee’s appearance; scalp and skull; muscle tone, strength, and size; reflexes; etc. 15-20 The Neuropsychological Evaluation Tests of general intellectual ability – Such tests (especially Wechsler tests) are frequently used in neuropsychological assessment – The varied tasks on the Wechsler scales make the tests particularly useful in neuropsychological screening – Certain patterns of test responses indicate particular deficits (pattern analysis) – Several researchers are working to develop a definitive sign of brain damage and as such have devised various ratios and quotients based on pattern analysis 15-21 The Neuropsychological Evaluation • Tests to measure abstract ability – One symptom associated with neuropsychological deficit is an inability or decreased ability to think abstractly • One traditional measure of verbal abstraction ability is the Wechsler Similarities Subtest – Nonverbal tests of abstraction include any test that requires the respondent to sort objects in some logical way (e.g., “group together those that belong together” and then follow-up questions) 15-22 The Neuropsychological Evaluation • Tests of executive function – Executive function: organizing, planning, cognitive flexibility, and inhibition of impulses and related activities associated with the frontal and prefrontal lobes of the brain • e.g., Tower of Hanoi, performance on mazes • Clock-drawing test (CDT): a test to quickly screen for certain executive functions 15-23 The Neuropsychological Evaluation • Tests of executive function – Trail-making item: a task that is thought to tap many abilities, including visuo-perceptual skills, working memory, and the ability to switch between tasks – Field-of-search item: the testtaker must scan a field of various stimuli to match a sample • Useful in discovering visual scanning deficits 15-24 The Neuropsychological Evaluation • Tests of perceptual, motor, and perceptualmotor function – Perceptual test: a general reference to any of many instruments and procedures used to evaluate varied aspects of sensory functioning – Motor test: a general reference of any of many instruments and procedures used to evaluate varied aspects of one’s ability and mobility – Perceptual-motor test: a general reference to any of many instruments and procedures used to evaluate the integration of perceptual and motor abilities 15-25 The Neuropsychological Evaluation • Tests of perceptual, motor, and perceptualmotor function – Jigsaw puzzles tap perceptual-motor ability – Ishihara (1964) screens for color blindness – Wepman Auditory Discrimination Test – Bruininks-Oseretsky Test of Motor Proficiency – Bender Visual-Motor Gestalt Test 15-26 The Neuropsychological Evaluation • Tests of verbal functioning – Verbal and writing fluency can be affected by brain injury • Aphasia: a loss of ability to express oneself or understand spoken or written language because of some neurological deficit • Controlled Word Association Test has the examinee recite as many words beginning with a particular letter as they can • Reitan-Indiana Aphasia Screening Test (AST) screens for aphasia 15-27 The Neuropsychological Evaluation • Tests of memory – Procedural memory: memory for skills (e.g., riding a bicycle) – Declarative memory: memory of factual material – Semantic memory: memory for facts – Episodic memory: memory for facts in a particular context or situation – A widely used test of memory is the California Verbal Learning Test-II (CVLT-II) – Other tests of memory include Wechsler Memory Scale (WMS-IV) and Seguin-Goddard Formboard 15-28 The Neuropsychological Evaluation • Neuropsychological test batteries – A neuropsychologist typically administers a battery of tests for clinical study • Fixed battery • Flexible battery – A flexible battery of tests involves hand-picked instruments relevant to the unique aspects of the patient and presenting problem • However, flexible test batteries risk overlapping with respect to some functions tested, thus wasting time and resources 15-29 The Neuropsychological Evaluation • Neuropsychological test batteries – Fixed neuropsychological test batteries are designed to comprehensively sample the patient’s neuropsychological functioning – Halstead-Reitan Neuropsychological Battery: • The most widely used fixed neuropsychological test battery • Requires a highly-trained examiner and a full workday to complete • Scoring yields a number referred to as the Halstead Impairment Index 15-30 The Neuropsychological Evaluation • Neuropsychological test batteries – Another fixed neuropsychological battery is the Luria-Nebraska Neuropsychological Battery (LNNB) • Contains scales to assess cognitive processes and functions • Analysis of scores may lead to judgments of whether neuropsychological impairment exists and which area of the brain is affected • Takes approximately 1/3 of the time to administer as the HR battery 15-31 The Neuropsychological Evaluation • Other tools of neuropsychological assessment – Neuropsychologists must be prepared to evaluate persons who are vision-impaired, hearingimpaired, or otherwise disabled – Perhaps the greatest advances in the field of neuropsychology includes high technology and the mutually-beneficial relationship between psychologists and medical personnel • MRI, fMRI, SPECT, CT, PET, EMG, EEG 15-32