Near- and far-surround suppression in human motion discrimination
Huan Wang1; Yifeng Zhou1; Tzvetomir Tzvetanov2
2017-07
会议名称2017年第二届曲阜视觉科学会议
会议日期2017.7.1
会议地点曲阜
摘要

PURPOSE: Neurons in middle temporal area (MT) have spatial antagonistic center-surround receptive fields. Surround activation globally inhibits responses to center stimuli is selective to their relative directions. These physiological observations are used to explain the center-surround motion repulsion effect. Furthermore, increasing the surround size above some radius does not suppress further neuronal responses, thus indicating a surround-to-center limit of interactions. In parallel, previous researches indicated that orientation tuning in V1 was modulated by near- and far-surrounds differently based on different anatomical circuits (intra-V1 horizontal connections and feedback connection from extrastriate cortex). Here, we want to investigate influences of near- and far-surround on center-surround motion repulsion effects and we used a simple physiological model of the repulsion effect to extract changes in surround inhibition strength and tuning widths with spatial distance.
METHODS: Human subjects performed motion discrimination tasks under near- and far-surround conditions, then, the model was fit to the data in order to understand the putative neuronal changes in center-surround effects with surround distance. Three major parameters were extracted: motion direction tuning width of the central neuronal population responding to the target motion (σ_s), surround-to-center inhibition strength of the maximum response rate of the center neurons (A_inh), and surround tuning width change with distance to the center.
RESULTS: All 11 subjects showed clear motion repulsion effects in near-surround condition while only 10 for the far-surround condition. The model predicted human performance well. σ_s in near-surround was significantly smaller than far-surround and the surround inhibition A_inh was stronger for near-surround condition.
CONCLUSIONS: These results showed that the increase of distance between surround and center not only decline the inhibitory effect of surround onto center, but importantly also increases the surround to center tuning width of inhibition.

关键词center-surround spatial inhibition motion repulsion
语种英语
文献类型会议论文
条目标识符http://ir.psych.ac.cn/handle/311026/22099
专题心理所主办学术会议_2017年第二届曲阜视觉科学会议_会议摘要
作者单位1.CAS Key Laboratory of Brain Function and Diseases and School of Life Sciences, University of Science and Technology of China, Hefei, P.R.China
2.School of Computer and Information, Hefei University of Technology, Hefei, P.R.China
推荐引用方式
GB/T 7714
Huan Wang,Yifeng Zhou,Tzvetomir Tzvetanov. Near- and far-surround suppression in human motion discrimination[C],2017.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Huan Wang]的文章
[Yifeng Zhou]的文章
[Tzvetomir Tzvetanov]的文章
百度学术
百度学术中相似的文章
[Huan Wang]的文章
[Yifeng Zhou]的文章
[Tzvetomir Tzvetanov]的文章
必应学术
必应学术中相似的文章
[Huan Wang]的文章
[Yifeng Zhou]的文章
[Tzvetomir Tzvetanov]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。