Distinct mechanisms control contrast adaptation over different timescales

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	Distinct mechanisms control contrast adaptation over different timescales
	Bao, Min1 ; Fast, Elizabeth 2; Mesik, Juraj 2; Engel, Stephen 2
刊名	JOURNAL OF VISION
	2013
卷号	13 期号:10
关键词	adaptation contrast timescale spontaneous recovery
ISSN号	1534-7362
通讯作者	Engel, S (reprint author), Univ Minnesota, Dept Psychol, Minneapolis, MN 55455 USA.
产权排序	1
英文摘要	Changes to the visual environment can happen at many timescales, from very transient to semi-permanent. To adapt optimally, the visual system also adjusts at different timescales, with longer-lasting environmental changes producing longer-lasting effects, but how the visual system adapts in this way remains unknown. Here, we show that contrast adaptation-the most-studied form of visual adaptation-has multiple controllers, each operating over a different time scale. In a series of experiments, subjects completed either a contrast matching, contrast detection, or tilt adjustment task, while adapting to contrast at one orientation. Following a relatively longer period (5 min) of adaptation to high contrast, subjects were "deadapted" for a shorter period (e. g., 40 s) to a lower contrast. Deadaptation eliminated perceptual aftereffects of adaptation, but continued testing in a neutral environment revealed their striking recovery. These results suggest the following account: Adaptation was controlled by at least two mechanisms, with initial adaptation affecting a longer-term one and deadaptation affecting a shorter-term one in the opposite direction. Immediately following deadaptation, the effects of the two mechanisms cancelled each other, but the short-term effects rapidly decayed, revealing ongoing longer-term adaptation. A single controlling mechanism cannot account for the observed recovery of effects, since once deadaptation cancels the initial longer-term adaptation, no trace of it remains. Combined with previous results at very long adaptation durations, the present results suggest that contrast adaptation is possibly controlled by a continuum of mechanisms acting over a large range of timescales.
学科主题	Cognitive psychology
收录类别	SCI
项目简介	This research was supported by grant NSF BCS-1028584 and the Key Research Program of the Chinese Academy of Sciences (KSZD-EW-TZ-003).
原文出处	http://www.journalofvision.org/content/13/10/14.full.pdf+html
语种	英语
WOS记录号	WOS:000326617800014
内容类型	期刊论文
源URL	[http://ir.psych.ac.cn/handle/311026/10651]
专题	心理研究所_中国科学院行为科学重点实验室
作者单位	1.Chinese Acad Sci, Inst Psychol, Key Lab Behav Sci, Beijing 100101, Peoples R China 2.Univ Minnesota, Dept Psychol, Minneapolis, MN 55455 USA
推荐引用方式 GB/T 7714	Bao, Min,Fast, Elizabeth,Mesik, Juraj,et al. Distinct mechanisms control contrast adaptation over different timescales[J]. JOURNAL OF VISION,2013,13(10).
APA	Bao, Min,Fast, Elizabeth,Mesik, Juraj,&Engel, Stephen.(2013).Distinct mechanisms control contrast adaptation over different timescales.JOURNAL OF VISION,13(10).
MLA	Bao, Min,et al."Distinct mechanisms control contrast adaptation over different timescales".JOURNAL OF VISION 13.10(2013).