Differential effects of 10-Hz and 40
... insight that lesions to the posterior parietal cortex can significantly impair processes of attention (Mesulam, 1981; Ro & Rafal, 1996). These patients have been found to be particularly impaired in responding to target stimuli in their neglected field after attention has just previously been direct ...
... insight that lesions to the posterior parietal cortex can significantly impair processes of attention (Mesulam, 1981; Ro & Rafal, 1996). These patients have been found to be particularly impaired in responding to target stimuli in their neglected field after attention has just previously been direct ...
Eye movement control by the cerebral cortex
... saccade paradigm is commonly used to study this function with eye movements. In this paradigm, the participant has to memorize the location of a target flashed in the peripheral visual field while fixating a central point, and then, after a delay of several seconds or more, make a memory-guided saccade ...
... saccade paradigm is commonly used to study this function with eye movements. In this paradigm, the participant has to memorize the location of a target flashed in the peripheral visual field while fixating a central point, and then, after a delay of several seconds or more, make a memory-guided saccade ...
Mechanisms of Visual Attention in the Human Cortex
... different objects and asked to identify two different attributes at the same time (e.g. color of one and orientation of the other), the subjects’ performance is worse than if the task had been performed with only a single object (Treisman 1969; Duncan 1980, 1984). Hence, because of limited processin ...
... different objects and asked to identify two different attributes at the same time (e.g. color of one and orientation of the other), the subjects’ performance is worse than if the task had been performed with only a single object (Treisman 1969; Duncan 1980, 1984). Hence, because of limited processin ...
Frontal Eye Field Neurons Reflect Covert, Serial Shifts of Attention
... each distractor differed independently from the target in either color or orientation. Because the target matched some of the distractors in each dimension, it was not the most salient stimulus in the array and had to be sought using only its remembered appearance. As we were interested in covert se ...
... each distractor differed independently from the target in either color or orientation. Because the target matched some of the distractors in each dimension, it was not the most salient stimulus in the array and had to be sought using only its remembered appearance. As we were interested in covert se ...
Is In-out asymmetry diagnostic of visual crowding? Ramakrishna
... a set of properties: masking impairs detection, whereas crowding only affects identification; masking scales with the size of the objects, whereas crowding does not; masking is independent of eccentricity, whereas crowding is deeply dependent on it. Hence, the diagnostic test to determine if a parti ...
... a set of properties: masking impairs detection, whereas crowding only affects identification; masking scales with the size of the objects, whereas crowding does not; masking is independent of eccentricity, whereas crowding is deeply dependent on it. Hence, the diagnostic test to determine if a parti ...
Neuroimaging of cognitive functions in human parietal cortex Jody C
... tools for mapping the human brain. Neuroimaging has been particularly successful in mapping cortical visual areas in the human occipital [1] and temporal [2] lobes. The human parietal lobes (excluding somatosensory regions, which are not discussed here), which traditionally fall into the category of ...
... tools for mapping the human brain. Neuroimaging has been particularly successful in mapping cortical visual areas in the human occipital [1] and temporal [2] lobes. The human parietal lobes (excluding somatosensory regions, which are not discussed here), which traditionally fall into the category of ...
mechanisms of visual attention in the human cortex
... different objects and asked to identify two different attributes at the same time (e.g. color of one and orientation of the other), the subjects’ performance is worse than if the task had been performed with only a single object (Treisman 1969; Duncan 1980, 1984). Hence, because of limited processin ...
... different objects and asked to identify two different attributes at the same time (e.g. color of one and orientation of the other), the subjects’ performance is worse than if the task had been performed with only a single object (Treisman 1969; Duncan 1980, 1984). Hence, because of limited processin ...
new insights into the functions of the superior temporal cortex
... Superior temporal cortex and neglect. Experimental lesions of the monkey posterior parietal cortex failed to elicit the complex behavioural abnormalities typically seen with spatial neglect in humans (for reviews, see REFS 15,16). This led to controversy about the anatomical and functional homology ...
... Superior temporal cortex and neglect. Experimental lesions of the monkey posterior parietal cortex failed to elicit the complex behavioural abnormalities typically seen with spatial neglect in humans (for reviews, see REFS 15,16). This led to controversy about the anatomical and functional homology ...
Stop Using Introspection to Gather Data for the Design of... Modeling and Spatial Assistance
... cognitive representation and processing of space? What's more, how might humanity have come to develop such spatial strategies to solve reasoning problems in daily life? Overall, the contribution focuses on both aspects of human introspection: representations and operations. It will be argued that ...
... cognitive representation and processing of space? What's more, how might humanity have come to develop such spatial strategies to solve reasoning problems in daily life? Overall, the contribution focuses on both aspects of human introspection: representations and operations. It will be argued that ...
Preattentive Filling-in of Visual Surfaces in Parietal Extinction
... Unilateral brain damage frequently produces “extinction,” in which patients can detect brief single visual stimuli on either side but are unaware of a contralesional stimulus if presented concurrently with an ipsilesional stimulus. Explanations for extinction have invoked deficits in initial process ...
... Unilateral brain damage frequently produces “extinction,” in which patients can detect brief single visual stimuli on either side but are unaware of a contralesional stimulus if presented concurrently with an ipsilesional stimulus. Explanations for extinction have invoked deficits in initial process ...
Full Article - CIHR Research Group in Sensory
... The two behavioural trends observed in this study were well represented in the activity of neurons recorded from the dSC (n = 28). The strong opposite-side advantage observed in both monkeys at the 250-ms CTOA was associated with a marked reduction in the magnitude of the target-aligned response for ...
... The two behavioural trends observed in this study were well represented in the activity of neurons recorded from the dSC (n = 28). The strong opposite-side advantage observed in both monkeys at the 250-ms CTOA was associated with a marked reduction in the magnitude of the target-aligned response for ...
interactions between number and space in parietal cortex
... hand, eye or attention movement). However, so far, no study has sufficiently shown whether these reference frames are eye- or world-centred. Another related question concerns the stage of processing at which spatial–numerical interactions arise; do they occur during stimulus comprehension, response ...
... hand, eye or attention movement). However, so far, no study has sufficiently shown whether these reference frames are eye- or world-centred. Another related question concerns the stage of processing at which spatial–numerical interactions arise; do they occur during stimulus comprehension, response ...
Top-Down Versus Bottom-Up Control of Attention in the Prefrontal
... (1–3). Imaging and neurophysiological studies have found neural correlates of both types in the frontal and posterior parietal cortices (1, 2, 4–6), but their respective contributions are not clear; they have largely been studied in separate experiments, rendering comparisons difficult and obscuring ...
... (1–3). Imaging and neurophysiological studies have found neural correlates of both types in the frontal and posterior parietal cortices (1, 2, 4–6), but their respective contributions are not clear; they have largely been studied in separate experiments, rendering comparisons difficult and obscuring ...
Top-Down Versus Bottom-Up Control
... (1–3). Imaging and neurophysiological studies have found neural correlates of both types in the frontal and posterior parietal cortices (1, 2, 4–6), but their respective contributions are not clear; they have largely been studied in separate experiments, rendering comparisons difficult and obscuring ...
... (1–3). Imaging and neurophysiological studies have found neural correlates of both types in the frontal and posterior parietal cortices (1, 2, 4–6), but their respective contributions are not clear; they have largely been studied in separate experiments, rendering comparisons difficult and obscuring ...
Topographic maps in human frontal and parietal cortex
... Subsequent investigations have used a variety of experimental paradigms including a visual spatial attention task [19], presentation of a colorful and dynamic periodic mapping stimulus [11], and a variation of the memoryguided saccade task originally used by Sereno and colleagues [20,21] to characte ...
... Subsequent investigations have used a variety of experimental paradigms including a visual spatial attention task [19], presentation of a colorful and dynamic periodic mapping stimulus [11], and a variation of the memoryguided saccade task originally used by Sereno and colleagues [20,21] to characte ...
The role of early visual cortex in visual integration: a neural model of
... the number of distractors. This suggests a parallel and ‘preattentive’ mechanism that can be implemented by the early retinotopic visual areas. On the other hand, when both target and distractors are composed of similar elementary features, the amount of time required to distinguish between them inc ...
... the number of distractors. This suggests a parallel and ‘preattentive’ mechanism that can be implemented by the early retinotopic visual areas. On the other hand, when both target and distractors are composed of similar elementary features, the amount of time required to distinguish between them inc ...
Neural correlates of attention in primate visual cortex
... development of a fovea, combined with the ability to make fast and accurate eye movements are among the sensory specializations that are aimed at sifting the wheat from the chaff in visual information processing. In addition to these bottom-up mechanisms, the visual system uses attention as a powerf ...
... development of a fovea, combined with the ability to make fast and accurate eye movements are among the sensory specializations that are aimed at sifting the wheat from the chaff in visual information processing. In addition to these bottom-up mechanisms, the visual system uses attention as a powerf ...
attention - CMU Graphics
... focus, creating an enhanced representation at that location that is akin to a local increase in contrast ...
... focus, creating an enhanced representation at that location that is akin to a local increase in contrast ...
Interactions between attention, context and learning in primary
... and feedback connections in the final outcome of visuospatial integration. The contextual influences for cells in V1 show a powerful facilitation that depends on the precise relative placement of line segments inside and outside the receptive field. Psychophysical experiments measuring the detectabi ...
... and feedback connections in the final outcome of visuospatial integration. The contextual influences for cells in V1 show a powerful facilitation that depends on the precise relative placement of line segments inside and outside the receptive field. Psychophysical experiments measuring the detectabi ...
reviews - Center for Complex Systems and Brain Sciences
... top-down, volitional component of attention16,17. As this aspect of attention has not been modelled in such detail, it is not our primary focus here. The control of focal visual attention involves an intricate network of brain areas (BOX 1). In a first approximation, selecting where to attend next i ...
... top-down, volitional component of attention16,17. As this aspect of attention has not been modelled in such detail, it is not our primary focus here. The control of focal visual attention involves an intricate network of brain areas (BOX 1). In a first approximation, selecting where to attend next i ...
A coincidence detector neural network model of selective attention
... characteristics. In one of Lavie’s studies participants were asked to determine whether a presented stimulus was the letter x or the letter z. In one condition, termed the highload, the letter was flanked by 5 other letters. In another condition, termed the low-load condition, the target was present ...
... characteristics. In one of Lavie’s studies participants were asked to determine whether a presented stimulus was the letter x or the letter z. In one condition, termed the highload, the letter was flanked by 5 other letters. In another condition, termed the low-load condition, the target was present ...
Attention as a decision in information space
... decisions need not be expressed in LIP, suggesting that this area ‘‘reads out’’ decision computations only in variable, task-specific manner. In a subsequent series of experiments we asked whether, in addition to responding to salient visual stimuli, LIP is also important for effortful, top-down att ...
... decisions need not be expressed in LIP, suggesting that this area ‘‘reads out’’ decision computations only in variable, task-specific manner. In a subsequent series of experiments we asked whether, in addition to responding to salient visual stimuli, LIP is also important for effortful, top-down att ...
The Physiology of the Senses Lecture 6 Visually Guided Actions
... the right most edge of this bar, your yellow lines is actually the same. Your line seems longer than the top one. action would, most likely, be pointing movement to these ends should accurate and not subject to this be accurate. illusion. Another distinguishing feature between the dorsal and ventral ...
... the right most edge of this bar, your yellow lines is actually the same. Your line seems longer than the top one. action would, most likely, be pointing movement to these ends should accurate and not subject to this be accurate. illusion. Another distinguishing feature between the dorsal and ventral ...