Deficit in figure-ground segmentation following closed head injury

Patient CB showed a severe impairment in figure-ground segmentation following a closed head injury. Unlike normal subjects, CB was unable to parse smaller and brighter parts of stimuli as figure. Moreover, she did not show the normal effect that symmetrical regions are seen as figure, although she w...

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Bibliographic Details
Published in:Neuropsychologia 1997-08, Vol.35 (8), p.1133-1138
Main Authors: Baylis, Gordon C., Baylis, Leslie L.
Format: Article
Language:English
Subjects:
Adult and adolescent clinical studies
attention
Biological and medical sciences
Cerebral Cortex - injuries
Cerebral Cortex - physiopathology
Female
Head Injuries, Closed - physiopathology
Humans
Injuries of the nervous system and the skull. Diseases due to physical agents
Medical sciences
Middle Aged
Organic mental disorders. Neuropsychology
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Traumas. Diseases due to physical agents
visual parsing
Visual Perception
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Description
Summary:Patient CB showed a severe impairment in figure-ground segmentation following a closed head injury. Unlike normal subjects, CB was unable to parse smaller and brighter parts of stimuli as figure. Moreover, she did not show the normal effect that symmetrical regions are seen as figure, although she was able to make overt judgments of symmetry. Since she was able to attend normally to isolated objects, CB demonstrates a dissociation between figure-ground segmentation and subsequent processes of attention. Despite her severe impairment in figure-ground segmentation, CB showed normal ‘parallel’ single feature visual search. This suggests that figure-ground segmentation is dissociable from ‘preattentive’ processes such as visual search.
ISSN:0028-3932
1873-3514
DOI:10.1016/S0028-3932(97)00013-4