The capacity limitations of orientation summary statistics

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• 作者：Mouna Attarha ; Cathleen M. Moore
• 关键词：Summary statistics ; Ensemble representations ; Mean orientation ; Processing capacity limitations ; Simultaneous–sequential method
• 刊名：Attention, Perception, & Psychophysics
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：77
• 期：4
• 页码：1116-1131
• 全文大小：1,397 KB
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• 作者单位：Mouna Attarha (1)
  Cathleen M. Moore (1)
  
  1. Department of Psychology, University of Iowa, E11 Seashore Hall, Iowa City, Iowa, 52242-1407, USA
  
• 刊物主题：Cognitive Psychology;
• 出版者：Springer US
• ISSN：1943-393X

文摘

The simultaneous–sequential method was used to test the processing capacity of establishing mean orientation summaries. Four clusters of oriented Gabor patches were presented in the peripheral visual field. One of the clusters had a mean orientation that was tilted either left or right, whereas the mean orientations of the other three clusters were roughly vertical. All four clusters were presented at the same time in the simultaneous condition, whereas the clusters appeared in temporal subsets of two in the sequential condition. Performance was lower when the means of all four clusters had to be processed concurrently than when only two had to be processed in the same amount of time. The advantage for establishing fewer summaries at a given time indicates that the processing of mean orientation engages limited-capacity processes (Exp. 1). This limitation cannot be attributed to crowding, low target–distractor discriminability, or a limited-capacity comparison process (Exps. 2 and 3). In contrast to the limitations of establishing multiple summary representations, establishing a single summary representation unfolds without interference (Exp. 4). When interpreted in the context of recent work on the capacity of summary statistics, these findings encourage a reevaluation of the view that early visual perception consists of creating summary statistic representations that unfold independently across multiple areas of the visual field.