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Monkeys show an oblique effect.

J A Bauer, D A Owens, J Thomas

    Perception
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Monkeys exhibit an "oblique effect," taking longer to align visual stimuli at higher spatial frequencies, especially for oblique orientations. This finding suggests monkeys are valuable models for studying visual processing anisotropies.

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    Area of Science:

    • Visual Neuroscience
    • Comparative Psychology

    Background:

    • Humans exhibit an

    Purpose of the Study:

    • To investigate whether monkeys display an oblique effect in visual alignment tasks.
    • To determine if monkeys serve as a suitable animal model for studying meridional anisotropies in vision.

    Main Methods:

    • Monkeys performed a visual alignment task using high-contrast square-wave gratings.
    • Stimuli varied in spatial frequency (6-24 cycles/degree) and orientation (horizontal, vertical, oblique).
    • Grating contrast was manipulated by blurring.

    Main Results:

    • Alignment time increased with spatial frequency, irrespective of grating orientation.
    • At higher spatial frequencies, alignment was slower for oblique gratings compared to horizontal and vertical ones.

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  • Reduced contrast further increased alignment times for oblique gratings.

    • Conclusions:

    • Monkeys demonstrate an oblique effect analogous to humans.
    • These results support the use of monkeys as an animal model for researching visual meridional anisotropies.