Evidence of fixed capacity in visual object categorization

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• 作者：Alec Scharff (1)
  John Palmer (1)
  Cathleen M. Moore (2)
  
• 关键词：Visual search ; Divided attention ; Object recognition ; Capacity limitations ; Simultaneous ; sequential paradigm
• 刊名：Psychonomic Bulletin & Review
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：18
• 期：4
• 页码：713-721
• 全文大小：524KB
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• 作者单位：Alec Scharff (1)
  John Palmer (1)
  Cathleen M. Moore (2)
  
  1. Department of Psychology, University of Washington, Seattle, WA, 98195, USA
  2. Department of Psychology, University of Iowa, Iowa City, IA, USA
  

文摘

How is visual object perception limited by divided attention? Whereas some theories have proposed that it is not limited at all (unlimited capacity), others have proposed that divided attention introduces restrictive capacity limitations or serial processing (fixed capacity). We addressed this question using a task in which observers searched for instances of particular object categories, such as a moose or squirrel. We applied an extended simultaneous-sequential paradigm to test the fixed-capacity and unlimited-capacity models (Experiment 1). The results were consistent with fixed capacity and rejected unlimited capacity. We ascertained that these results were due to attention, and not to sensory interactions such as crowding, by repeating the experiment using a cuing paradigm with physically identical displays (Experiment 2). The results from both experiments were consistent with theories of object perception that have fixed capacity, and they rejected theories with unlimited capacity. Both serial and parallel models with fixed capacity remain viable alternatives.