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Shared attentional resources for global and local motion processing.

Paul F Bulakowski1, David W Bressler, David Whitney

  • 1Department of Psychology, University of California, Davis, CA, USA. pbulakowski@ucdavis.edu

Journal of Vision
|November 14, 2007
PubMed
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Visual attention flexibly shifts between global and local processing. A shared attentional resource manages perception of large-scale patterns and fine details, demonstrating a trade-off between spatial scales.

Area of Science:

  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Visual attention is flexible, allowing perception across different spatial scales.
  • Understanding how attention allocates resources between global and local features is crucial.

Purpose of the Study:

  • To investigate if global and local motion perception compete for a common attentional resource.
  • To determine if attention flexibly shifts between spatial scales for motion and orientation perception.

Main Methods:

  • Subjects performed direction discrimination tasks with precues valid for either global or local motion.
  • A trade-off in performance was measured as precue validity shifted between scales.
  • A second experiment used static-oriented Gabors to assess orientation perception.

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Main Results:

  • A trade-off was observed between global and local motion perception thresholds.
  • Attending to local orientation impaired global orientation perception, and vice versa.
  • Motion discrimination showed higher sensitivity than orientation discrimination.

Conclusions:

  • A shared attentional resource flexibly allocates to different spatial scales.
  • This resource enables perception of both local and global features, whether defined by motion or orientation.