|Alternative Title||The Exploration for Neural Processes Underlying Visual Motion Perception and Its Cross-Modal Modulation|
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|
|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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