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题名:
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
作者: Gaoxing Mei; Xue Dong; Min Bao
通讯作者: Min Bao
通讯作者邮箱: baom@psych.ac.cn
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
出版日期: 2016
关键词: contrast adaptation ; interocular suppression ; curvature ; visual processing hierarchy ; adaptation mechanisms
学科分类: 感知觉心理学
英文摘要:

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.

收录类别: 其他
会议主办者: 中国科学院心理研究所
会议网址: 查看原文
语种: 英语
内容类型: 会议论文
URI标识: http://ir.psych.ac.cn/handle/311026/20811
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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

Recommended Citation:
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]. 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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文件名: 2016Poster(CAS).pdf
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