中央凹皮层在外周物体识别过程中的时间可变的反馈处理
其他题名Temporally flexible feedback processing in foveal cortex for peripheral object recognition
Xiaoxu Fan; Lan Wang; Hanyu Shao; Daniel Kersten; Sheng He
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
会议主办者中国科学院心理研究所
其他摘要

PURPOSE: Recent studies have shown that information from peripherally presented images can be obtained from foveal retinotopic cortex, presumably due to feedback signals. The current study is designed to investigate whether such a feedback processing is temporally ?exible.
METHODS: We investigated this potential feedback signal by presenting noise in fovea at di?erent object-noise SOAs while subjects performed a discrimination task on peripheral objects.
RESULTS: First, we found a selective impairment of performance when a foveal noise was presented around 250 ms following the onset of the peripheral presentation of objects. Then we tested whether foveal processing is automatically engaged as soon as peripheral object information reaches higher levels of cortex. If so, we would predict a rather fixed temporal window for the foveal noise to be effective (i.e., around 250 ms); however, when the two peripheral objects were oriented differently and mental rotation was required for the discrimination task, the engagement of foveal processing was delayed as revealed by a systematic shift of the effective temporal window of foveal noise.
CONCLUSIONS: During processing spatially detailed object information in the periphery, the foveal retinotopic cortex is engaged at a ?exible time point when ?ne detail information is needed.

关键词feedback fovea object recognition vision
学科领域感知觉心理学
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收录类别其他
语种英语
文献类型会议论文
条目标识符http://ir.psych.ac.cn/handle/311026/20856
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 Lab of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, 15 DatunRoad, Beijing 100101, China
2.Department of Psychology, University of Minnesota, 75 E. River Rd., Minneapolis, Minnesota 55455, USA.
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Xiaoxu Fan,Lan Wang,Hanyu Shao,等. 中央凹皮层在外周物体识别过程中的时间可变的反馈处理[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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