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Related Experiment Videos

"Where" and "what" in vision.

D Sagi, B Julesz

    Science (New York, N.Y.)
    |June 7, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Visual search for simple features like orientation relies on parallel processing for location but requires focused attention for identification. This highlights the distinct roles of preattentive and attentive vision in visual perception.

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    Area of Science:

    • Cognitive Psychology
    • Neuroscience
    • Visual Perception

    Background:

    • Preattentive vision allows rapid processing of basic visual elements.
    • Focal attention is traditionally linked to recognizing complex features and combinations.

    Purpose of the Study:

    • To investigate the attentional mechanisms underlying feature discrimination.
    • To differentiate between parallel and serial processing in visual search tasks.

    Main Methods:

    • Experiment involving visual search for line segments with varying orientations.
    • Analysis of reaction times for locating and identifying features.

    Main Results:

    • Parallel processing efficiently determines the location of features.

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  • Discriminating feature orientation (e.g., horizontal vs. vertical) necessitates serial search via focal attention.
  • Identifying 'what' a feature is, even a single one, requires time-consuming focal attention.

    • Conclusions:

    • Location ('where') is processed preattentively, while identification ('what') requires focal attention.
    • Current attention theories may need refinement regarding single-feature recognition.