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Original Articles

Maintaining the ties that bind: The role of an intermediate visual memory store in the persistence of awareness

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Pages 187-210
Received 01 Jul 2004
Accepted 02 Oct 2006
Published online: 10 Apr 2007

Segregation and feature binding are essential to the perception and awareness of objects in a visual scene. When a fragmented line-drawing of an object moves relative to a background of randomly oriented lines, the previously hidden object is segregated from the background and consequently enters awareness. Interestingly, in such shape-from-motion displays, the percept of the object persists briefly when the motion stops, suggesting that the segregated and bound representation of the object is maintained in awareness. Here, we tested whether this persistence effect is mediated by capacity-limited working-memory processes, or by the amount of object-related information available. The experiments demonstrate that persistence is affected mainly by the proportion of object information available and is independent of working-memory limits. We suggest that this persistence effect can be seen as evidence for an intermediate, form-based memory store mediating between sensory and working memory.

The authors would like to acknowledge Kendra Hollidge and Justin Ruppel for assistance with data collection. Sincere thanks also to Maha Adamo and Arin Klug for helpful comments. This research was supported by a Natural Sciences and Engineering Research Council of Canada (NSERC) grant awarded to the first author.

 

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