题目：Perceptual cycles and waves
报告人：
Prof. Rufin VanRullen
Centre de Recherche Cerveau et Cognition (CerCo), CNRS, Toulouse, France
时间：
2016年2月26日（周五）
13:00 - 15:00
地点：
北京大学王克桢楼1113室
联系人：
罗欢 研究员
摘要：
Various pieces of experimental evidence using both psychophysical and physiological (EEG) measurements have lead us (and others) to conclude that at least certain aspects of visual perception and attention are intrinsically rhythmic. For example, in a variety of perceptual and attentional tasks, the trial-by-trial outcome was found to depend on the precise phase of pre-stimulus EEG oscillations in specific frequency bands (between 7 and 15Hz). This suggests that there are “good” and “bad” phases for perception and attention; in other words, perception and attention proceed as a succession of cycles. These cycles are normally invisible, but in specific situations they can be directly experienced as an illusory flicker superimposed on the static scene. The brain oscillations that drive these perceptual cycles are not strictly spontaneous, but can also be modulated by visual stimulation, giving rise to perceptual "echoes" of the stimulation sequence. Further, these echoes propagate across the visual and cortical space with specific and robust phase relations. In other words, the perceptual cycles are actually perceptual waves.
主讲人简介：
VanRullen博士于2000年在Paul Sabatier 大学（法国Toulouse） 获得认知科学博士学位，2000-2002年在加州理工大学Christof Koch实验室从事博士后研究，2005年至2007年哈佛大学视觉实验室访问学者。2007年获得欧洲优秀青年研究者奖(European Young Investigator Award, EURYI)，2012-2014担任Psychological Science副主编。VanRullen研究员通过一系列认知心理学实验结合脑成像技术和计算模型率先发现并进而提出：脑认知是一个离散周期化的操作过程。他是这一领域的先锋人物，发表了一批包括Trends in Cognitive Science, Current Biology, PNAS, Journal of Neuroscience等具有高影响力的学术论文。
