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Paper Abstract and Keywords
Presentation 2008-07-15 15:30
[Invited Talk] [Invited Speaker]
Masatoshi Yoshida (NIPS)
Abstract (in Japanese) (See Japanese page) 
(in English) It has been reported that macaque monkeys with unilateral lesions in V1 exhibited analogous behavior to the human blindsight patients (Cowey and Stoerig, 1995). Here we examined behavioral report of visual awareness in monkeys with unilateral V1 lesions using saccade tasks and sought neural activity specific to blindsight.
First we examined their visual awareness using comparison between the performance of a forced-choice (FC) task, in which localization of target positions was required, and that of a yes-no (YN) task, in which detection of the targets was required. The performance of the FC task was better than that of the YN task when stimuli were presented in the affected hemifield. Such a dissociation of performance was not observed when stimuli with low luminance contrasts were presented in the ipsilateral ('normal') hemifield, indicating that the dissociation is specific to the V1 lesion, not a general phenomena occurring in near-threshold vision.
Then we examined whether the neural activity of SC during the YN task is dependent on the monkeys' report on visual awareness. We found that, in the ipsilesional SC, the neural response to the visual stimuli in the affected hemifield was larger when the monkeys successfully detect the targets than when the monkeys missed them. Such modulation was not found in the neural response to the near-threshold stimuli in the normal hemifield when we recorded from the contralesional SC. These results suggest that the modulation of neural activity found in the ipsilesional SC is a neural correlate of reduced visual awareness that specifically induced by V1 lesion.
Keyword (in Japanese) (See Japanese page) 
(in English) blindsight / decision / saccade / consciousness / awareness / / /  
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Conference Information
Committee NC  
Conference Date 2008-07-15 - 2008-07-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyoto Univ. (Yoshida campus) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Recording and analysis of neuronal activity, etc 
Paper Information
Registration To NC 
Conference Code 2008-07-NC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) [Invited Speaker] 
Sub Title (in English)  
Keyword(1) blindsight  
Keyword(2) decision  
Keyword(3) saccade  
Keyword(4) consciousness  
Keyword(5) awareness  
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1st Author's Name Masatoshi Yoshida  
1st Author's Affiliation National Institute for Physiological Sciences (NIPS)
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Speaker Author-1 
Date Time 2008-07-15 15:30:00 
Presentation Time 60 minutes 
Registration for NC 
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Volume (vol) vol.108 
Number (no) no.130 
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