早期视觉皮层加工反馈信息的神经机制——fMRI和ERP证据
Alternative TitleFeedback Signal Contributes to The Flash Grab Effect: Evidence from fMRI and ERP Study
Hao Zhou; Yijun Ge; Lan Wang; Peng Zhang; Sheng He
2016
Conference Name2016年第一届北京视觉科学会议
Conference Date2016-07
Conference Place北京
Funding Organization中国科学院心理研究所
Other Abstract

PURPOSE: When a line is flashed on a patterned disk rotating back and forth at its turnaround point, the perceived location of the line is often dramatically displaced, known as the flash grab effect (Cavanagh & Anstis, 2013). Like other illusions in the motion induced position shift family, the neural mechanism of the flash grab effect remains unclear.
METHODS: We conducted a combined fMRI and ERP study to investigate the spatial and temporal neural correlates of this perceptual effect. In different sessions, participants viewed the visual display showing the flash grab illusion repeatedly in the fMRI scanner and with ERP recording sessions. The physical flashes were presented at the vertical meridian, while the perceived locations of the flashes were either to the left or the right of the vertical meridian.
RESULTS: Following the localization of the retinotopic visual areas in each participant, results clearly show that the distribution of fMRI BOLD signals in V1, V2, and V3 could be well predicted by the perceived, but not the physical, positions of the flashes. In the ERP signals, while a robust and clearly lateralized C1 was seen from physically displaced flashed lines, no such lateralized signal was observed in the typical time window of C1 from the perceptually displaced flashes, suggesting that the perceptual illusion was unlikely a result of feedforward processing. For the perceptually displaced flashes, there was a hint of a lateralized signal in the occipital area about 20ms later than C1, and significantly lateralized ERP signals emerge only at the later N1 component.
CONCLUSIONS: Taken together, the combined spatio- temporal imaging results suggest that the perceived displacement of the flashed target in the flash grab effect is instigated by feedback signals from high-level areas to early retinotopic visual cortex.

Keywordthe flash grab effect fMRI ERP
Subject Area感知觉心理学
URL查看原文
Indexed By其他
Language英语
Document Type会议论文
Identifierhttp://ir.psych.ac.cn/handle/311026/20817
Collection心理所主办、承办、协办学术会议_2016年第一届北京视觉科学会议_会议摘要
Affiliation1.State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China, 100101
2.Department of Psychology, University of Minnesota, Minneapolis, Minnesota, USA, 55414
Recommended Citation
GB/T 7714
Hao Zhou,Yijun Ge,Lan Wang,等. 早期视觉皮层加工反馈信息的神经机制——fMRI和ERP证据[C]. 见:2016年第一届北京视觉科学会议. 北京. 2016-07.http://vision.csp.escience.cn/dct/page/1.
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