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Varieties of object constancy.

R Ellis, D A Allport, G W Humphreys

    The Quarterly Journal of Experimental Psychology. A, Human Experimental Psychology
    |November 1, 1989
    PubMed
    Summary
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    Visual perception benefits from recognizing objects, even from different angles. This object recognition is faster when the viewpoint is consistent, suggesting distinct visual processing codes.

    Area of Science:

    • Cognitive Psychology
    • Visual Perception
    • Neuroscience

    Background:

    • Understanding how the brain processes visual information is crucial for cognitive science.
    • Previous research has explored object recognition and viewpoint invariance.

    Purpose of the Study:

    • To investigate the effects of object identity and viewpoint on visual recognition speed.
    • To explore the nature of visual codes involved in object perception.

    Main Methods:

    • Three experiments presented sequences of object images to subjects.
    • Subjects rapidly decided if pictured objects shared the same name.
    • Stimulus-onset asynchrony (SOA) and image variations (viewpoint, size, retinal location) were manipulated.

    Main Results:

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    • Object benefit (same object, different view) and viewpoint benefit (same object, same view) facilitated recognition.
    • These benefits persisted despite changes in image size and retinal location.
    • Object benefit decreased at shorter SOAs (100 msec), while viewpoint benefit remained.
    • A performance decrement occurred when matching similar views of the same object under size variation.

    Conclusions:

    • The findings suggest at least two distinct visual coding systems.
    • One code is non-retinotopic and viewer-centered, while the other is object-centered.
    • These codes contribute differentially to visual recognition based on object and viewpoint consistency.