Illusory conjunctions in simultanagnosia: Coarse coding of visual feature location?

McCrea, Simon M.; Buxbaum, Laurel J.; Coslett, H. Branch

doi:10.1016/j.neuropsychologia.2006.03.017

Cited by 14 publications

(22 citation statements)

References 53 publications

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“…Closer examination of Designs II revealed that loci of the problem was an inability to remember the content of the items (age scaled score = 4) whereas remembrance of the spatial location of an item was intact (age scaled score = 8). McCrea, Coslett and Buxbaum (2006) have shown that integrity of the dorsal occipitoparietal cortex is essential for mapping spatial locations and in 3A's case these regions were intact [68]. Damage to the right superior parietal lobule, then, could have resulted in a disconnection of the right dorsolateral prefrontal cortex from the right superior parietal lobule involved in spatial working memory [69].…”

Section: Constructionally Apraxic Tree Drawingsmentioning

confidence: 99%

“…In this context, although spatial location based mechanisms would be intact, these spacebased mechanisms would nonetheless be unable to manage the numerous location/object identity combinations or binding of locations with the object [68]. Participant 3A was also impaired on Part B of the Trail-Making Test (T=30) [70] and the Booklet Category Test (T=28) [55] consistent with a nonverbal executive function impairment.…”

Section: To the Trunk Of The Tree (Left) Tree Drawing By Constructiomentioning

confidence: 99%

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Free-Drawing from Memory in Constructional Apraxia: A Case Series

McCrea¹

2015

AJPN

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Abstract:Constructional apraxia is a neuropsychological and neurological impairment in activities such as building, assembling, and drawing. In this study data is presented on the performance of left and right hemisphere single focal stroke lesion participants on drawing tasks of houses, trees, and persons. Forty-one participants completed a comprehensive neuropsychological battery including the house-tree-person drawing task. The drawings were then rated as exhibiting signs of neurological impairment or non-impairment by three evaluators without knowledge of the medical condition of the patient. There was 72% agreement between the three evaluators of the 123 drawings. Both an analysis of variance and case series analysis was used to examine the data. Patterns of concordance with a previously outlined detailed neuropsychological model of constructional apraxia were found and the implications of the results are analyzed in the context of the current neuropsychological literature.

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Section: Constructionally Apraxic Tree Drawingsmentioning

confidence: 99%

Section: To the Trunk Of The Tree (Left) Tree Drawing By Constructiomentioning

confidence: 99%

Free-Drawing from Memory in Constructional Apraxia: A Case Series

McCrea¹

2015

AJPN

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“…Directing attention to a location at the Master Map of Locations serves to highlight the corresponding location in the visual feature maps with the consequence that the distinct features at that location are linked to the same location. The attentionrequiring process of binding visual feature information can be disrupted in normal subjects by reducing stimulus presentation time or, in patients with brain dysfunction, by lesioning the parietal lobes (McCrea, Buxbaum, & Coslett, 2006;Robertson & Treisman, 2006;Robertson, Treisman, Friedman-Hill, & Grabowecky, 1997). One consequence of this disruption is the production of ''illusory conjunction'' errors in which visual features are miscombined to produce a percept that is, in fact, not present in the array.…”

Section: Introductionmentioning

confidence: 99%

“…One consequence of this disruption is the production of ''illusory conjunction'' errors in which visual features are miscombined to produce a percept that is, in fact, not present in the array. For example, McCrea et al (2006) reported that their patient, E.D., reported seeing a red T when shown an array containing red ''S''s and green ''T''s (see also Humphreys, Cinel, Wolfe, Olsen, & Klempen, 2000;Friedman-Hill, Maldonado, & Gray, 1995). Although FIT was developed to account for binding of visual information in early vision, illusory conjunctions have also been demonstrated with more complex stimuli such as letters and even words.…”

Section: Introductionmentioning

confidence: 99%

“…Although FIT was developed to account for binding of visual information in early vision, illusory conjunctions have also been demonstrated with more complex stimuli such as letters and even words. In the latter instance, letters may be mislocated so that subjects report words not present in the array (e.g., mean read as ''amen'';McCrea et al, 2006; see also Robertson et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Simultanagnosia: When a Rose Is Not Red

Coslett

Lie²

2008

Journal of Cognitive Neuroscience

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Information regarding object identity (''what'') and spatial location (''where/how to'') is largely segregated in visual processing. Under most circumstances, however, object identity and location are linked. We report data from a simultanagnosic patient (K.E.) with bilateral posterior parietal infarcts who was unable to ''see'' more than one object in an array despite relatively preserved object processing and normal preattentive processing. K.E. also demonstrated a finding that has not, to our knowledge, been reported: He was unable to report more than one attribute of a single object. For example, he was unable to name the color of the ink in which words were written despite naming the word correctly. Several experiments demonstrated, however, that perceptual attributes that he was unable to report influenced his performance. We suggest that binding of object identity and location is a limited-capacity operation that is essential for conscious awareness for which the posterior parietal lobe is crucial. ) and spatial location (''where/how to'') is largely segregated in visual processing. Under most circumstances, however, object identity and location are linked. We report data from a simultanagnosic patient (K.E.) with bilateral posterior parietal infarcts who was unable to ''see'' more than one object in an array despite relatively preserved object processing and normal preattentive processing.K.E. also demonstrated a finding that has not, to our knowledge, been reported: He was unable to report more than one attribute of a single object. For example, he was unable to name the color of the ink in which words were written despite naming the word correctly. Several experiments demonstrated, however, that perceptual attributes that he was unable to report influenced his performance. We suggest that binding of object identity and location is a limited-capacity operation that is essential for conscious awareness for which the posterior parietal lobe is crucial. &

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Disorders of higher visual processing

Barton

2011

Handbook of Clinical Neurology

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Illusory conjunctions in simultanagnosia: Coarse coding of visual feature location?

Cited by 14 publications

References 53 publications

Free-Drawing from Memory in Constructional Apraxia: A Case Series

Free-Drawing from Memory in Constructional Apraxia: A Case Series

Simultanagnosia: When a Rose Is Not Red

Disorders of higher visual processing

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