麦戈文脑科学研究所学术讲座
题目：Is Biological Motion Special? A Psychophysical and Computational Investigation
报告人： Hongjing Lu
Departments of Psychology and Statistics, UCLA
时间：2014年3月11日（周二）下午13:00-14:00 PM
地点：新生物楼101报告厅
邀请人：Prof.Fang Fang
摘要：Many animal species are sensitive to motion patterns generated by other living organisms, presumably due to the ecological importance of biological motion. Human observers show an exquisite ability to accurately identify attributes of an actor, such as identity, emotional state and gender, even when the stimulus lacks a detailed human body form (e.g., a point-light display). However, it remains unclear whether superior perception of biological motion is supported by distinct and specialized mechanisms. In this talk, I will present behavioral and computational evidence showing that both specialized and generic mechanisms are involved in analyzing biological motion. For motion analysis, humans are tuned to two basic characteristics specialized to biological motion: efficient detection of a signature movement, and sensitivity to the congruency between the direction of global body motion and the direction implied by intrinsic limb movements. However, for form analysis, we found no evidence for differences in the visual processing of biological motion versus non-biological object movements. A Bayesian model will be described, which shows that the dynamic form analysis underlying biological motion perception is based on a generic mechanism for integrating probabilistic position and orientation signals in a rational way.
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