网站地图 联系我们搜索内部网English | 中国科学院
首页 所况简介 机构设置 科研队伍 科学研究平台 院地合作 党群园地 国际交流 博士后 研究生教育 科学传播 信息公开
科研进展
成果报道
最新重要论文(影响因子PNAS及以上)
发表论文数据库
所级学术报告
科学成果
发表论文
专著
专利
获奖
专题
所史丛书
所庆专辑
建所50周年画册
现在位置:首页 > 科研进展 > 最新重要论文(影响因子PNAS及以上)
Temporally flexible feedback signal to foveal cortex for peripheral object recognition, PNAS, Publicated online, 26 Spt. 2016
2016-10-10 | 【     】【打印】【关闭

PNAS, Publicated online, 26 Spt. 2016, doi:10.1073/pnas.1606137113

Temporally flexible feedback signal to foveal cortex for peripheral object recognition

Xiaoxu Fana,b, Lan Wanga, Hanyu Shaoa, Daniel Kerstenc, and Sheng Hea,c,1

Abstract

Recent studies have shown that information from peripherally presented images is present in the human foveal retinotopic cortex, presumably because of feedback signals. We investigated this potential feedback signal by presenting noise in fovea at different object–noise stimulus onset asynchronies (SOAs), whereas subjects performed a discrimination task on peripheral objects. Results revealed a selective impairment of performance when foveal noise was presented at 250-ms SOA, but only for tasks that required comparing objects’ spatial details, suggesting a task- and stimulus-dependent foveal processing mechanism. Critically, the temporal window of foveal processing was shifted when mental rotation was required for the peripheral objects, indicating that the foveal retinotopic processing is not automatically engaged at a fixed time following peripheral stimulation; rather, it
occurs at a stage when detailed information is required. Moreover, fMRI measurements using multivoxel pattern analysis showed that both image and object category-relevant information of peripheral objects was represented in the foveal cortex. Taken together, our results support the hypothesis of a temporally flexible feedback signal to the foveal retinotopic cortex when discriminating objects in the visual periphery.

相关报道:http://www.ibp.cas.cn/kyjz/zxdt/201609/t20160927_4669892.html

文章链接:http://www.pnas.org/content/early/2016/09/23/1606137113

 

评 论
                 
版权所有:中国科学院生物物理研究所     京ICP备05002792号 京公网安备 110402500011 号
地址:北京市朝阳区大屯路15号(100101) 电话:010-64889872
意见反馈联系人:马秋云 电子邮件:maqiuyun@moon.ibp.ac.cn