Early scale effect and hemisphere superiority on the visual spatial attention:From the electrophysiological evidence of
The visual attention mechanism in the brain was studied among 16 young subjects through the precue-target visual search paradigm using the event-related potentials (ERPs) technique, with the attentive ranges cued with different scales of Chinese words. The results showed that the response time was shortened as the cue scale was reduced, while the amplitudes of the P1 and N1 components of the ERPs increased. These results not only provided the electrophysiological evidence supporting the spotlight theory, but also indicated that the spotlight effect occurred during the early period of the selected attention. Two kinds of separation in the P2 effect were observed. One separation was between the P1 effect and P2 effect, which meant that additional computation was needed when the spatial scale of attention was enlarged; the other was between the left and right hemisphere of the P2 effect, which indicates that the attentive processing of the cue range mainly occurred in the left hemisphere.
作 者： SONG Weiqun GAO Yuan LUO Yuejia 作者单位： SONG Weiqun(Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China)GAO Yuan(Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China)
LUO Yuejia(Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China;School of Psychology, Southwest China Normal University, Chongqing 400715, China)
刊 名： 自然科学进展(英文版) SCI 英文刊名： PROGRESS IN NATURAL SCIENCE 年，卷(期)： 2004 14(10) 分类号： Q424 关键词： visual spatial attention cue scale spotlight effect hemisphere superiority event-related potential (ERP)