1987 Fiscal Year Final Research Report Summary
Brain Potential Associated with Saccadic Eye Movement Pauses during Visual Cognitive Tasks.
| Project/Area Number |
61510065
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Psychology
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| Research Institution | Kwansei Gakuin University |
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Principal Investigator |
YAGI Akihiro School of Humanities,Professor, 文化部, 教授 (50166477)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Visual Cognition / Eye Movement / EEG / Lambda Response / Signal Detection / Event Related potential / 事象関連電位 / 大脳両半球機能差 |
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| Research Abstract |
An eye movement record shows step-like pattern consisting of saccades and fixation pauses.In previors studies,we found that the polyphasic potentials,which had been called the lambda responses,appeared at onset of saccadic fixation pauses.The lambda responses can be obtained wiht averaging EEG at onset of fixation pauses.The purpose of this project was to examine the lambda responses during some cognitive tasks. This project consisted of three experimental studies.Preceding the first experiment,a processing system and computer programs were developed to analyze the brain potentials associated with fixation pauses.
In Experiment 1,the relationship between the lambda responses and characteristics of visual stimuli (the contrast and the spatial frequency) was examined.As a result,the higher spatial frequency and the stronger contrast of visual stimuli caused larger lambda responses in amplitude. In Experiment 2,lambda responses recorded from the left and the right hemispheres were compared during the verbal task and the pattern task. Amplitudes of the lambda responses at the left parietal region were larger in the verbal task than those in the pattern task.
In Experiment 3,the lambda responses during the signal detection task were recorded.The large positive potentials with latency about 300 msec following the lambda responses were elicited,when eyes paused at signals which were detected,
These results showed that the lambda response might be a kind of visual evoked potentials (VEP).The movement of eyes are usually very restricted in measuring VEP.The lambda responses are of great advantage to measure visral cognitive processes rather than VEP,because the lambda response is applicable in eye movement situations.
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Research Products
(12 results)
