三维大小错觉加工的时程机制

项目名称： 三维大小错觉加工的时程机制

项目编号： No.31300833

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 医药、卫生

项目作者： 张阳

作者单位： 苏州大学

项目金额： 24万元

中文摘要： 对三维空间中客体的大小知觉，很大程度上受到对该客体空间距离知觉的影响。有着相同尺寸的两个客体，随着对其距离知觉的不同会产生截然不同的大小知觉。尽管有研究表明一些功能区域如初级视觉皮层区域，同三维大小错觉有着密切的联系，但迄今为止，对人类大脑在何时如何表征及加工这种三维大小错觉的问题还知之甚少。本项目通过巧妙的设计排除线索背景不匹配的混淆后，利用心理物理法和高时间分辨率的ERP技术结合不同层次的知觉深度线索（单眼和双眼深度线索）来系统地考察三维大小错觉加工的时间进程机制。并进一步通过基于源重建的模型分析技术，对三维大小错觉加工涉及的脑功能区域以及这些功能区域之间的相互关系，在三维大小错觉加工中的作用进行初步的探讨。研究结果将帮助我们了解大脑对三维大小错觉加工的时间过程（即，大脑什么时候在什么区域开始表征和加工三维大小错觉），并初步建立这一加工过程的认知脑机制模型。

中文关键词： 三维大小错觉；C1成分；事件相关电位；；

英文摘要： Size perception in a 3D scene is known to be affected by distance perception. Two objects with the same physical size appear to have very different sizes if they are perceived to be at different distances. A couple of areas, such as primary visual cortex area (V1), have been suggested to be involved in the experience of the 3D size illusion. However, when our brain start to represent and processing the 3D size illusion remains largely unknown. In the current project, we are planning to use the methods of psychophysics and event-related potentials (ERP) to investigate the time course of brain activity related to the 3D size illusion processing triggered by two types of depth cue (a monocular 3D background and binocular convergence angles). Psychophysically, we measured the magnitude of the 3D size illusion by asking participates to adjust the size of a ball on a uniform background to match the perceived size of a ball (either near or far) in a 3D scene. Electrophysiologically, we acquired EEG data while participates were asked to detect a small dot occurred on the edge of balls with a small probability. In the monocular cue studies, we will manipulate the position and contrast of the ball to construct four experimental conditions (high contrast far, low contrast far, high contrast near and low contrast near condi

英文关键词： 3D size illusion；C1；ERPs；；