BACKGROUND:Previous studies of attentional control have focused primarily on pre-cue control of attentional cue and direction. OBJECTIVE:To measure the differences in electrical activity of brain cells while processin...BACKGROUND:Previous studies of attentional control have focused primarily on pre-cue control of attentional cue and direction. OBJECTIVE:To measure the differences in electrical activity of brain cells while processing pre-cue and post-cue compound stimuli,and to explore brain electrical activity during global and local processing of compound stimuli according to electroencephalogram(EEG) recordings. DESIGN,TIME AND SETTING:A within-subject design study was performed at the School of Psychology,State Key Laboratory of Cognitive Neuroscience and Learning,Beijing Normal University,China from March to May 2006. PARTICIPANTS:A total of 30 healthy,undergraduate students,aged 17-24 years,comprising 12 males and 18 females,were voluntarily enrolled from Beijing Normal University.Subjects exhibited normal or corrected-to-normal visual acuity.No significant non signal wave drift was detected during testing. METHODS:A total of 30 subjects were subjected to pre-cue and post-cue compound stimulus processing using event-related potential and EEG recordings. MAIN OUTCOME MEASURES:Evoked potential was recorded in different brain regions utilizing event-related potential to observe hemispheric symmetry,cue consistency and global-local features. RESULTS:Pre-cue compound stimuli resulted in hemispheric asymmetry for early wave(N1) and late wave(P3) in anterior brain regions.Early- and late-wave induced hemispheric asymmetry for electrode points(O1,O2,P3,P4,Pz,F3,F4,F7,F8,Fz,FP1,FP2,T7,T8,C3,C4,and Cz) during processing of pre-cue compound stimuli(P<0.05).Post-cue compound stimuli did not induce hemispheric asymmetry of brain waves induced by the above-described electrode points.No significant differences in global and local responses were determined during processing of post-cue compound stimuli.Under pre-cue conditions,significant differences were observed in N1 and P3 in the above-mentioned electrode points(P<0.05).However,under post-cue conditions,no significant differences were observed in N1 and P3 using the above-mentioned electrode points.Significant differences in early waves(N1 and P1) using the above-mentioned electrode points were detected between anterior and posterior brain regions,regardless of consistent or inconsistent,large or small letters(P<0.05). CONCLUSION:Cue location effected mechanisms underlying global and local processing of compound stimuli.Pre- or post-cue conditions resulted in differences in hemispheric symmetry,cue consistency,and global and local features.Under pre-cue conditions,hemispheric dominance was detected in global and local processing following compound stimuli.Under post-cue conditions, hemispheric dominance was not determined.展开更多
基金the Planning Program Foundation of Application and Experimental Psychology of Beijing Key Laboratory from 2008 to 2009.No.JD100270541
文摘BACKGROUND:Previous studies of attentional control have focused primarily on pre-cue control of attentional cue and direction. OBJECTIVE:To measure the differences in electrical activity of brain cells while processing pre-cue and post-cue compound stimuli,and to explore brain electrical activity during global and local processing of compound stimuli according to electroencephalogram(EEG) recordings. DESIGN,TIME AND SETTING:A within-subject design study was performed at the School of Psychology,State Key Laboratory of Cognitive Neuroscience and Learning,Beijing Normal University,China from March to May 2006. PARTICIPANTS:A total of 30 healthy,undergraduate students,aged 17-24 years,comprising 12 males and 18 females,were voluntarily enrolled from Beijing Normal University.Subjects exhibited normal or corrected-to-normal visual acuity.No significant non signal wave drift was detected during testing. METHODS:A total of 30 subjects were subjected to pre-cue and post-cue compound stimulus processing using event-related potential and EEG recordings. MAIN OUTCOME MEASURES:Evoked potential was recorded in different brain regions utilizing event-related potential to observe hemispheric symmetry,cue consistency and global-local features. RESULTS:Pre-cue compound stimuli resulted in hemispheric asymmetry for early wave(N1) and late wave(P3) in anterior brain regions.Early- and late-wave induced hemispheric asymmetry for electrode points(O1,O2,P3,P4,Pz,F3,F4,F7,F8,Fz,FP1,FP2,T7,T8,C3,C4,and Cz) during processing of pre-cue compound stimuli(P<0.05).Post-cue compound stimuli did not induce hemispheric asymmetry of brain waves induced by the above-described electrode points.No significant differences in global and local responses were determined during processing of post-cue compound stimuli.Under pre-cue conditions,significant differences were observed in N1 and P3 in the above-mentioned electrode points(P<0.05).However,under post-cue conditions,no significant differences were observed in N1 and P3 using the above-mentioned electrode points.Significant differences in early waves(N1 and P1) using the above-mentioned electrode points were detected between anterior and posterior brain regions,regardless of consistent or inconsistent,large or small letters(P<0.05). CONCLUSION:Cue location effected mechanisms underlying global and local processing of compound stimuli.Pre- or post-cue conditions resulted in differences in hemispheric symmetry,cue consistency,and global and local features.Under pre-cue conditions,hemispheric dominance was detected in global and local processing following compound stimuli.Under post-cue conditions, hemispheric dominance was not determined.
