老化对视觉运动加工过程中皮层内和皮层间抑制功能有不同影响
其他题名Different aging effects on intra- and inter-areal inhibition in visual motion perception
Weiying Chen; Shenbing Kuang; Tao Zhang
2016
会议名称2016年第一届北京视觉科学会议
会议日期2016-07
会议地点北京
摘要PURPOSE :Motion perception is important for human beings to interplay with environment, such as walking through the street to avoid moving vehicles. Psychophysical researches on human beings reveal that the old people show accumulating deficits in motion perception. Previous studies suggesting decreased neuronal inhibition in visual system accounts for some of the de?cits. However, some visual functions in the old remain the same or even better than young people, suggesting aging a?ect di?erent inhibitory mechanisms di?erently. This research want to prove this assumption.
METHODS: Here we used motion repulsion and drifting gabor direction discrimination paradigms to investigate inhibitory machanism. Motion repulsion refers to the phenomenon observers overestimate the perceived angle when two superimposed dot patterns moving at an acute angle. The misperception has been interpreted as mutual inhibition between nearby direction-tuned neurons within the same cortical area. At high contrast, the drifting gabor direction discrimination threshold increases with the enlargement of the gabor size. This is considered as behavioral manifestation of surround suppression and directed by feedback inhibition from higher cortical regions to primary visual cortex.
RESULTS: We found motion repulsion in elder people was much larger than younger ones. But the increase of motion discrimination threshold with enlargement of drifting gabor size in older group was much less than younger group
CONCLUSIONS: We suggest that the altered motion repulsion in the aged may result from enhanced mutual inhibition in the same area. The decreased change of threshold in the old group is consistent with previous findings. We interpret this result as attenuated feedback inhibition from higher level area to lower level area. Our data indicates that aging a?ect intra-areal inhibition and inter-areal inhibition in visual motion system di?erently.
会议主办者中国科学院心理研究所
关键词aging motion repulsion motion discrimination mutual inhibition feedback inhibition
学科领域感知觉心理学
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语种英语
文献类型会议论文
条目标识符http://ir.psych.ac.cn/handle/311026/20851
专题心理所主办学术会议_2016年第一届北京视觉科学会议_会议摘要
作者单位1.State Key Laboratory of Brain and Cognitive Science, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
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Weiying Chen,Shenbing Kuang,Tao Zhang. 老化对视觉运动加工过程中皮层内和皮层间抑制功能有不同影响[C]. 见:2016年第一届北京视觉科学会议. 北京. 2016-07.http://vision.csp.escience.cn/dct/page/1.
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