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Related Experiment Videos

On the spatial extent of attention in object-based visual selection

N Lavie1, J Driver

  • 1Department of Psychology, University College London, England. n.lavie@ucl.ac.uk

Perception & Psychophysics
|November 1, 1996
PubMed
Summary
This summary is machine-generated.

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New research shows object-based limits on divided visual attention can occur over large distances. However, these limits disappear when attention is spatially focused, suggesting object-based selection is confined to attended regions.

Area of Science:

  • Cognitive Psychology
  • Visual Attention Research

Background:

  • Previous measures of object-based limits on divided visual attention were confounded by spatial factors.
  • Understanding these limits is crucial for explaining how the brain processes visual information.

Purpose of the Study:

  • To devise a new test to isolate object-based limits on divided visual attention from spatial effects.
  • To investigate whether object-based attention operates across large spatial extents and under focused attention conditions.

Main Methods:

  • A novel experimental design manipulated object distinctions across wide spatial extents.
  • Participants judged whether target elements on dashed lines were the same or different.
  • Object and spatial configurations were orthogonally varied to disentangle their effects.

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Main Results:

  • Participants performed better when targets were far apart on a single object compared to when they were close but on different objects.
  • This object-based advantage persisted even across large distances.
  • When participants were precued to a narrow spatial region, the object-based effect was eliminated.

Conclusions:

  • Nonstrategic object-based limits on divided visual attention can arise independently of spatial proximity, even over large distances.
  • Object-based selection appears to be constrained within spatially attended regions, indicating an interaction between object and spatial attention.