深度运动认知的脑电研究——速度因素的影响

Study on ERP for Perception of Motion-in-depth——the Effect of Speed Factor on Cognition

对深度运动过程的研究是视运动知觉研究中非常重要的课题。本研究采用一种接近人真实视觉经验的实验范式,通过改变逼近物体的速度参数,采集正常人在直接深度运动过程中的128道脑电数据。通过主成分分析,发现速度对N220、P140和P300成分有显著的影响,然后应用归一化最小模解研究有关主要成分的皮层电流源密度图,得到深度运动激活的主要脑区及其时空动力学响应。综合这些时-空信息,本研究提出:人类对持续的深度运动过程的感知很可能是在额区的持续调控下多脑区间相互协同作用的结果。

To investigate motion-in-depth（MID） course is an important theme in visual motion perception.This paper takes an experimental paradigm more close to human＇s real visual experience,through changing the looming object＇s speed,collects 128 channels EEG data of normal human on direct motion-in-depth course. The event-related potentials（ERPs） were analyzed using multiple spatio-temporal methods.Combining with principal component analysis（PCA）,it was found that the speed of looming object had significant effects on the N220,P140 and P300.Then by means of the Normalized Minimum Norm（NMN）,we got the cortical current source density graphs of the related main components.Hereby we obtained main brain areas activated by MID and their spatio-temporal dynamic responses.With the obtained spatio-temporal information,we propose that the continuous MID perception of human might be the results of the integration and cooperation among multi areas under the continuous controlling from frontal area.