Decreased brain activation along with increased inter-stimulus interval in the Posner Task

摘要：

　　In experimental paradigms,voluntary orienting of visual-spatial attention is conventionally achieved through the Posner task in which predictive central cues are presented to indicate the location of an upcoming peripheral target,followed by varying inter-stimulus interval (ISI).Previous studies have indicated that the effects of ISI on spatial attention can occur.However,to date,brain mechanisms associated with ISI effects remain unclear.We investigated the brain activity changes along with increased ISI.Behaviorally,subjects exhibited no difference in the different ISI conditions.However,neuroimaging data revealed reduced activity in the posterior cingulate cortex (PCC) as ISI becomes longer.We propose that,as time went on,the strength of visual-spatial bias reduced,resulting in decreased PCC activation.

关键词： Posner task Visual-spatial attention Posterior cingulate cortex(PCC) Functional magnetic resonance imaging(fMRI) Visual-spatial bias

作者: Yujie Li Chunlin Li Yuya Kawata Jinglong Wu Tomoko Kurata Seiichiro Ohno Susumu Kanazawa Koji Abe

作者单位: Biomedical Engineering Laboratory, Graduate School of Natural Science and Technology, Okayama Univer Biomedical Engineering Laboratory, Graduate School of Natural Science and Technology, Okayama Univer Department of Neurology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama Central Division of Radiology, Okayama University Hospital, Okayama, Japan Department of Radiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama

会议类型: 国际会议

会议名称: 2013 ICME International Conference on Complex Medical Engineering(2013 ICME复合医学工程国际会议)

会议地点: 北京

会议语种:英文

页码: 160-164

在线出版日期: 2013-05-25（万方平台首次上网日期，不代表论文的发表时间）