Visual Extinction and Stimulus Repetition

Five patients with visual extinction following unilateral brain injury were briefly presented with colored letters in either or both visual fields, and required to report and locate the colors or the shapes. On double simultaneous stimulation, they tended to miss the event contralateral to their les...

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Bibliographic Details
Published in:Journal of cognitive neuroscience 1993-10, Vol.5 (4), p.453-466
Main Authors: Baylis, Gordon C., Driver, Jon, Rafal, Robert D.
Format: Article
Language:English
Subjects:
Adult and adolescent clinical studies
Biological and medical sciences
Brain
Eyes & eyesight
Head injuries
Medical sciences
Organic mental disorders. Neuropsychology
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
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Summary:Five patients with visual extinction following unilateral brain injury were briefly presented with colored letters in either or both visual fields, and required to report and locate the colors or the shapes. On double simultaneous stimulation, they tended to miss the event contralateral to their lesion. This extinction was increased when the two stimuli were the same on the reported dimension, Similarity on the irrelevant dimension had no effect. These data suggest that extinguished colors and shapes may be correctly extracted by the visual system (when task-relaant) even though they are unavailable for verbal report. An analogy is made with the phenomena of “repetition blindness” in normal observers, and it is proposed that extinction may reflect failure in a token-individuation process for correctly extracted visual types.
ISSN:0898-929X
1530-8898
DOI:10.1162/jocn.1993.5.4.453