Spatial distribution of attention and inter-hemispheric competition

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• 作者：Kao Yamaoka ; Chikashi Michimata
• 关键词：Spatial attention ; Hemispheric asymmetry ; Attentional distribution ; Inter ; hemispheric competition ; Visual extinction ; Salient singleton
• 刊名：Cognitive Processing
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：16
• 期：4
• 页码：417-425
• 全文大小：474 KB
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• 作者单位：Kao Yamaoka (1)
  Chikashi Michimata (1)
  
  1. Department of Psychology, Sophia University, Tokyo, Japan
  
• 刊物主题：Neurosciences; Behavioural Sciences; Artificial Intelligence (incl. Robotics);
• 出版者：Springer Berlin Heidelberg
• ISSN：1612-4790

文摘

Considerable evidence has demonstrated functional asymmetry in spatial attention between the left and right hemispheres. In the present study, we aimed to examine the theoretical models of spatial attention by considering distribution and inter-hemispheric competition in neurologically healthy participants. Participants searched for a green circle target among green diamond non-targets in the presence or absence of a red singleton. Assuming that the salient singleton would increase the activation of the corresponding hemisphere, we manipulated the sides of the singleton visual fields and target visual fields. When the salient singleton was presented to the right visual field, target detection was faster for left visual field targets than for right visual field targets. In contrast, when the salient singleton was presented to the left visual field, target detection time was equivalent for left and right visual field targets. These results suggest that when the perceptually salient singleton acts as an activator, distribution of attention differs depending on the activated hemisphere induced by inter-hemispheric competition. These findings are in line with Kinsbourne’s opponent processor theory. Keywords Spatial attention Hemispheric asymmetry Attentional distribution Inter-hemispheric competition Visual extinction Salient singleton