title: Brain dynamic mechanisms of scale effect in visual spatial attention.
abstract: The dynamic mechanisms of the early event-related potential scale effect of different attentive regions in the brain was studied. The paradigm of this experiment is the precue-target visual search paradigm by event-related potential technique. The results showed that the reaction time was shortened with the reduction of cue scale, a cue to how big the search area would be, and fixed target stimulus, while the amplitudes of P1 and N1 components of event-related potentials increased. These results not only provided the electrophysiological evidences that supported the zoom-lens theory, but also indicated that the zoom-lens effect happened at the early selected attention period. The results also showed that there existed two kinds of separation in the P2 effect.
authors.affiliation: Department of Rehabilitation, Xuanwu Hospital, Capital University of Medical Science, Beijing Normal University, Beijing, China.
authors.forename: Wei-Qun
authors.initials: WQ
authors.lastname: Song
authors.forename: Xinying
authors.initials: X
authors.lastname: Li
authors.forename: Yue-Jia
authors.initials: YJ
authors.lastname: Luo
authors.forename: Bo-Qi
authors.initials: BQ
authors.lastname: Du
authors.forename: Xun-Ming
authors.initials: XM
authors.lastname: Ji
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001288:Attention / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D003463:Cues; D004569:Electroencephalography / Q000379:methods; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods