初级和中级视觉通路上适应机制的时间尺度初探
其他题名Exploring timescales of adaptation mechanisms at low- to mid-level visual areas
Gaoxing Mei; Xue Dong; Min Bao
2016
会议名称2016年第一届北京视觉科学会议
通讯作者邮箱baom@psych.ac.cn
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: Visual environment changes at multiple timescales. It is thus hypothesized that adaptation mechanisms operate at differing timescales to accommodate the environmental changes. This has been demonstrated in recent work. However, neural substrates of these adaptation mechanisms remain unclear. To address this issue, two psychophysical experiments were conducted.
METHODS: Using the interocular suppression paradigm, in Experiment 1a and 1b we firstly investigated the timescales of adaptation before and after cortical processing stage by tracking the time courses of contrast adaptation effects under different viewing conditions(monocular, binocular, and dichoptic). To compare the timescales of mechanisms spanning wider in the visual processing hierarchy, in Experiment 2 we further tracked the decay of tilt aftereffect after adaptation to either a compound grating pattern (curvature) or its component gratings.
RESULTS: Results of Experiment 1a demonstrated that slower adaptation mechanisms were more predominant for the monocular condition than for the binocular condition. Results of Experiment 1b also showed that the residual adaptation effects were larger in the monocularly adapting condition and the dichoptically orthogonal adapting condition than that in the binocular adapting condition. Considering that interocular suppression is stronger in the binocular condition, and it mostly occurs on the cortical level, results of Experiment 1a and 1b might indicate that adaptation mechanisms at the binocular processing stages were longer-term. Further, the results Experiment 2 revealed a slower decay for the compound [mid-level (e.g. V4)] than for the component (early visual areas) adaptation condition, suggesting longer-term mechanisms in the mid-level (e.g. V4) than the early visual areas.
CONCLUSIONS: Our findings indicate that neural mechanisms controlling visual adaptation may become more sluggish along the visual processing stream, at least from low- to mid-level processing stages.

关键词contrast adaptation interocular suppression curvature visual processing hierarchy adaptation mechanisms
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/311026/20811
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
通讯作者Min Bao
作者单位1.Key Laboratory of Behavioral Science, Institute of Psychology, Chinese Academy of Sciences, Beijing, P.R. China, 100101
2.Department of Psychology, Guizhou Normal University, Guiyang, P.R. China, 550025
推荐引用方式
GB/T 7714
Gaoxing Mei,Xue Dong,Min Bao. 初级和中级视觉通路上适应机制的时间尺度初探[C],2016.
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