【学术报告】（下周四，Mar. 31）Suppressive neural mechanisms

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学术报告Suppressive neural mechanisms: from perception to intelligence讲座信息时间：2016年3月31日（周四）13:00 - 14:30
地点：北京大学王克桢楼1113室
报告人：DUJE TADIN, Ph.DAssociate ProfessorDept. of Brain and Cognitive SciencesUniversity of Rochester
邀请人：方方 教授
摘要Perception operates on an immense amount of incoming information that greatly exceeds the brain`s processing capacity. Because of this fundamental limitation, the ability to suppress irrelevant information is a key determinant of perceptual efficiency. Here, I will present a series of studies investigating suppressive mechanisms in visual motion processing, namely perceptual suppression of large, background-like motions. These spatial suppression mechanisms are adaptive, operating only when sensory inputs are sufficiently robust to guarantee visibility. Converging correlational and causal evidence links these behavioral results with inhibitory center-surround mechanisms, namely those in cortical area MT.What are functional roles of spatial suppression? Spatial suppression is weaker in old age and schizophrenia—as evident by paradoxically better-than-normal direction discriminations of large moving stimuli. Moreover, these subjects also exhibit deficits in figure-ground segregation, suggesting a functional connection. In recent studies, we report direct experimental evidence for a functional link between spatial suppression and figure-ground segregationFinally, I will argue that the ability to suppress information is a fundamental neural process that applies not only to perception but also to cognition in general. Supporting this argument, we find that individual differences in spatial suppression of motion signals strongly predict individual variations in IQ scores (r = 0.71).
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