DocumentCode :
612357
Title :
Decreased brain activation along with increased interstimulus interval in the Posner task
Author :
Yujie Li ; Chunlin Li ; Kawata, Yoshimasa ; Jinglong Wu ; Kurata, T. ; Ohno, S. ; Kanazawa, S. ; Abe, Kiyohiko
Author_Institution :
Biomed. Eng. Lab., Okayama Univ., Okayama, Japan
fYear :
2013
fDate :
25-28 May 2013
Firstpage :
160
Lastpage :
164
Abstract :
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.
Keywords :
biomedical MRI; brain; visual perception; Posner task; brain mechanism; decreased brain activation; experimental paradigm; increased interstimulus interval; peripheral target; posterior cingulate cortex; predictive central cues; visual spatial attention; voluntary orienting; Biomedical imaging; Brain; Educational institutions; Magnetic resonance imaging; Neuroimaging; Neuroscience; Visualization; Functional magnetic resonance imaging (fMRI); Posner task; Posterior cingulate cortex (PCC); Visual-spatial attention; Visual-spatial bias;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Complex Medical Engineering (CME), 2013 ICME International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-2970-5
Type :
conf
DOI :
10.1109/ICCME.2013.6548231
Filename :
6548231
Link To Document :
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