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Related Experiment Videos

Mental imagery and the third dimension.

S Pinker

    Journal of Experimental Psychology. General
    |September 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Mental images preserve metric 3-D and 2-D geometric information, not just 2-D snapshots or 3-D models. This suggests a complex mapping of 3-D object data onto a 2-D display for mental visualization.

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    Area of Science:

    • Cognitive Psychology
    • Visual Perception
    • Mental Imagery

    Background:

    • Understanding the underlying medium of mental imagery for three-dimensional (3-D) scenes is crucial for cognitive science.
    • Previous models proposed mental images as either 2-D snapshots or 3-D scale-models, lacking empirical validation for geometric information preservation.

    Purpose of the Study:

    • To investigate the geometric information preserved in mental images of 3-D scenes.
    • To differentiate between 2-D snapshot, 3-D scale-model, and a more complex representational model of mental imagery.

    Main Methods:

    • Subjects mentally scanned between objects in a learned 3-D display under different scanning conditions (point tracking, rifle sight).
    • Scanning times were measured and correlated with 2-D and 3-D inter-object distances.

    Related Experiment Videos

  • Perceptual control experiments using visible displays were conducted for comparison with mental scanning.

    • Main Results:

    • Scanning times increased linearly with 3-D distances when tracking a point, indicating preservation of metric 3-D information.
    • Scanning times increased linearly with 2-D separations when using a rifle sight, indicating preservation of metric 2-D perspective information.
    • Mental image scanning times differed from eye-movement times, suggesting distinct underlying processes.

    Conclusions:

    • Mental images preserve both metric 3-D structure and 2-D perspective information, refuting simple 2-D snapshot or 3-D scale-model theories.
    • A proposed model suggests 3-D object-centered coordinate systems are mapped onto a dynamic 2-D surface display for visualization.
    • Mental imagery and visual perception share representational structures, but the scanning process in mental imagery is distinct from eye movements.