PSYCH OpenIR  > 健康与遗传心理学研究室
Alternative TitleThe Exploration for Neural Processes Underlying Visual Motion Perception and Its Cross-Modal Modulation
Publication Place北京
Contribution Rank1



1.选择概率在VIP神经元中是普遍存在的,统计分析表明与神经元对自身运动的优选方 向是一致的。选择概率与眼动追踪状态有关,VIP脑区神经元可能特异性地参与了有眼动追踪情况下的自身运动方向判别。

2。不同视觉运动的速度线索影响时间感知的正确性,低速时时间压缩,高速时呈现时间 膨胀效应。视觉运动遮蔽后的时间测试窗口长短决定了时间感知是压缩或是膨胀,短时程测试倾向于时间膨胀,易受其他视觉运动信息的干扰,且冲动性越高,越倾向于时间压缩。长时程测试倾向于时间压缩,时间估计的正确性与问卷填写时间长短、注意力分散程度有统计学上的一致性,且不易受其他视觉运动线索干扰,表明视运动对短时和长时的时间感知存在不同的影响机制。


Other Abstract

On basis of the eye-movement model, the current postdoctoral studies consist of three projects:

1 .ale first try to find out whether the heading information carried by VIP neuron be actually used by the monkey to form perceptual decision, by combining extracellular recording technique, psychophysical experimental design and behavioral task. Choice probability was used here to quantify such relationship, which represents the covariation between fluctuation of VIP neuron and monkeys' judgment in heading direction. We further investigated the interaction between pursuit eye movement and choice probability to explore whether VIP neurons particularly involved in heading judgments while eye movement exists. 2. Psychophysical measurements were used to investigate the effects of visual-motion perception on interval timing, in which a novel ongoing timing measurement was applied to assess the accuracy of time perception by covering a moving target or not. We further try to provide evidences to support the hypothesis that two differential neural processes involve in short- and long-term interval timing. 3. In addition, we intent to investigate the cross-modal modulation of pain by vision of noxious event and own body in an independent project. We got some significant findings as following:

Significant choice probabilities were common in `VIP neurons. Moreover, choice probabilities were significantly higher when the monkey was compensating for ongoing pursuit eye movement, indicating that VIP activity is directly involved in heading judgments, which dependent upon pursuit.

Timing accuracy was affected by the prior velocity of a moving target, in which either compression in lower velocity or dilatation in higher velocity was produced in motion covering. Moreover, the durations of covered phase also determined the temporal compression and dilatation in long-term and short-term interval timing respectively. Only the short-term rather than long-term timing accuracy was disturbed by the visual distractions in background, which may correspond to differential neural mechanisms.

Viewing a moderately noxious laser projecting onto own hand produce a significant reduction in pain ratings. Moreover, the trial-by-trial data reveal that the visual deceptions may bias pain perception by Gaussian rules, providing experimental evidence in support of the common advice to increase patient's belief in sham operation during visual feedback-based cognitive therapy of pain diseases.

Keyword自身运动 眼动 选择概率 神经元 时间感知 疼痛
Document Type科技报告
Recommended Citation
GB/T 7714
李胜光. 视觉运动感知的神经机制及跨模态交互影响初探[R]. 北京,2014.
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