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
Alternative TitleDifferent aging effects on intra- and inter-areal inhibition in visual motion perception
Weiying Chen; Shenbing Kuang; Tao Zhang
2016
Conference Name2016年第一届北京视觉科学会议
Conference Date2016-07
Conference Place北京
AbstractPURPOSE :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.
Funding Organization中国科学院心理研究所
Keywordaging motion repulsion motion discrimination mutual inhibition feedback inhibition
Subject Area感知觉心理学
URL查看原文
Indexed By其他
Language英语
Document Type会议论文
Identifierhttp://ir.psych.ac.cn/handle/311026/20851
Collection心理所主办、承办、协办学术会议_2016年第一届北京视觉科学会议_会议摘要
Affiliation1.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
Recommended Citation
GB/T 7714
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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