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Spatial maps of directed visual attention.

H C Hughes, L D Zimba

    Journal of Experimental Psychology. Human Perception and Performance
    |August 1, 1985
    PubMed
    Summary
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    Visual attention speeds responses to expected locations, but not across the entire visual field. Attention effects are confined to the same visual hemifield, challenging the "beam" metaphor.

    Area of Science:

    • Cognitive Psychology
    • Neuroscience
    • Visual Attention Research

    Background:

    • Spatial expectancy influences visual reaction times (RTs).
    • Faster RTs occur at expected locations, slower RTs at contralateral locations.
    • Previous research often used the 'beam' metaphor for attention.

    Purpose of the Study:

    • To investigate the spatial extent of visual attention effects.
    • To determine if attention effects are limited to a specific hemifield.
    • To test the validity of the spatially restricted 'beam' model of attention.

    Main Methods:

    • Subjects expected visual targets at specific locations.
    • Probe flashes were presented at various locations across the visual field.
    • Reaction times (RTs) to expected and unexpected probes were measured.

    Related Experiment Videos

    Main Results:

    • RTs were fastest at the expected location.
    • RTs to probes in the same hemifield as expectancy were facilitated.
    • RTs to probes in the opposite hemifield were uniformly slower.
    • No expectancy effects were observed when expected and unexpected locations were in the same hemifield.

    Conclusions:

    • Visual attention effects are hemifield-specific.
    • The spatially restricted 'beam' metaphor for attention is inaccurate.
    • Attention's spatial scope is broader than a narrow beam but limited to one hemifield.