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Related Experiment Videos

Visual selection mediated by location: feature-based selection of noncontiguous locations.

N P Bichot1, K R Cave, H Pashler

  • 1Vanderbilt University, Nashville, Tennessee, USA.

Perception & Psychophysics
|May 20, 1999
PubMed
Summary

Spatial attention can be split across two locations simultaneously when targets are easily distinguished from distractors. This finding suggests the brain can process multiple distinct visual stimuli at once.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Attention

Background:

  • Understanding the limits of human attention is crucial for various fields, including human-computer interaction and safety-critical systems.
  • Previous research has explored attentional capacity, but the ability to simultaneously attend to multiple non-adjacent locations remains debated.

Purpose of the Study:

  • To investigate whether spatial attention can be divided and allocated to two distinct, non-adjacent locations simultaneously.
  • To determine if basic visual properties influence the ability to split attention.

Main Methods:

  • Experiments employed two distinct methodologies using visual stimuli (colored digits and oriented gratings).
  • Participants performed tasks requiring them to attend to stimuli presented in multiple frames or locations.

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  • A spatial probe task was used to assess the distribution of attention across target and distractor locations.

    • Main Results:

    • Accuracy for simultaneously presented targets was comparable to successively presented targets, suggesting simultaneous attention.
    • Similar results were observed across different stimulus types (digits and gratings).
    • The spatial probe experiment confirmed that attention could be successfully allocated to both target locations, outperforming attention to distractors.

    Conclusions:

    • These findings provide strong evidence that spatial attention can be split across multiple, non-adjacent locations.
    • The ability to split attention is facilitated when targets possess easily discriminable basic visual properties.
    • This research advances our understanding of the flexibility and capacity of the human attentional system.