同时追踪全局和局部加工:MEG研究
其他题名Concurrent tracking of global and local processing using MEG
Ling Liu; Huan Luo
2016
会议名称2016年第一届北京视觉科学会议
会议日期2016-07
会议地点北京
会议主办者中国科学院心理研究所
其他摘要

PURPOSE: Visual scenes contain local and global properties. Numerous behavioral studies demonstrate that the global features are processed more rapidly than local features, namely global precedence effect. However, the neuronal temporal dynamics underlying the global and local processing as well as their interactions remains largely unknown.
METHODS: To address the issue, we recorded magnetoencephal-ography (MEG) from 20 human subjects as they viewed 5-sec long glass pattern stimuli, the luminance of which was randomly modulated continuously. Critically, the form coherence of glass pattern was also randomly and independently modulated simultaneously. Based on the two random sequences (luminance and form coherence) within one trial, we were able to calculate and separate the brain response that specifically tracks changes in local and global property from the same MEG responses, by employing a temporal response function technique (TRF).
RESULTS: The TRF for local and global property processing showed quite distinct spatiotemporal patterns. Specifically, local feature changes elicited activations in early visual area (EVA) around 100 msec. Global features, on the other hand, elicited much earlier responses (< 50 msec), which first developed in orbitofrontal cortex (OFC), then in V3A, V1, and TPJ. We further examined the interactions between global and local processing and found a two-stage course. In particular, within 100~200 msec, the OFC activations in global processing negatively correlated with EVA activities in local processing, suggesting a global-local competition relationship, whereas within 200-300 msec, OFC and TPJ responses in global processing and EVA responses in local processing showed a positive relationship, implicating a global-local integration process.
CONCLUSIONS: Our experiments, by employing a new technique, successfully enables the dissociation of global and local processing within the same trial response. Commensurate with previous findings, our results support that OFC initiates the coarse-to-?ne process in visual perception. The global and local process undergoes competition and then integration.

关键词Global-local global precedence OFC MEG TRF
学科领域感知觉心理学
URL查看原文
收录类别其他
语种英语
文献类型会议论文
条目标识符http://ir.psych.ac.cn/handle/311026/20818
专题心理所主办学术会议_2016年第一届北京视觉科学会议_会议摘要
作者单位1.Department of Psychology, Peking University, 52 Haidian Road, Haidian Dist, Beijing, China, 100871
2.IDG/McGovern Institute for Brain Research, Peking University, 52 Haidian Road, Haidian Dist, Beijing, China, 100871
推荐引用方式
GB/T 7714
Ling Liu,Huan Luo. 同时追踪全局和局部加工:MEG研究[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.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Ling Liu]的文章
[Huan Luo]的文章
百度学术
百度学术中相似的文章
[Ling Liu]的文章
[Huan Luo]的文章
必应学术
必应学术中相似的文章
[Ling Liu]的文章
[Huan Luo]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。