Document Detail

Perception of apparent motion of colored stimuli after commissurotomy.
MedLine Citation:
PMID:  8904741     Owner:  NLM     Status:  MEDLINE    
One subject with complete forebrain commissurotomy (L.B.), another with posterior callosotomy (D.K.), and eight normal controls were presented with successive pairs of red and/or green lights, on either side of the retinal midline and within the left and right visual fields. All of the subjects could discriminate the direction of apparent motion in all three locations, although L.B. was poorer on bilateral than unilateral presentations. Moreover, on bilateral presentations, L.B. was significantly poorer at identifying the color of the first light than the color of the second light. In contrast, D.K., like the control subjects, was equally good at identifying the color of either light. These and other results provide evidence that a subcortical shift in attention enables L.B. to discriminate the direction of apparent motion across the midline. On the other hand, a more robust mechanism involving the middle temporal area of the cortex must be responsible for tracking motion in D.K. and the control subjects. On the basis of these findings, it is suggested that the superior colliculus may contribute to direction sensitivity in the middle temporal area by mediating shifts in spatial attention.
N Naikar
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuropsychologia     Volume:  34     ISSN:  0028-3932     ISO Abbreviation:  Neuropsychologia     Publication Date:  1996 Nov 
Date Detail:
Created Date:  1997-03-18     Completed Date:  1997-03-18     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0020713     Medline TA:  Neuropsychologia     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1041-9     Citation Subset:  IM; S    
Department of Psychology, University of Auckland, New Zealand.
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MeSH Terms
Attention / physiology
Color Perception / physiology*
Corpus Callosum / physiopathology,  surgery*
Discrimination Learning / physiology
Dominance, Cerebral / physiology*
Epilepsy / physiopathology,  surgery
Hippocampus / physiopathology,  surgery
Intracranial Arteriovenous Malformations / physiopathology,  surgery
Motion Perception / physiology*
Optical Illusions / physiology*
Orientation / physiology
Postoperative Complications / physiopathology*
Superior Colliculi / physiopathology,  surgery
Temporal Lobe / physiopathology,  surgery
Vision, Binocular / physiology
Vision, Monocular / physiology

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