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Related Experiment Videos

Coding left and right.

W S Farrell

    Journal of Experimental Psychology. Human Perception and Performance
    |February 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Discriminating left and right arrows is harder than up and down arrows in visual displays. This difficulty persists across response types and may stem from less symmetrical spatial coding for left-right.

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    Area of Science:

    • Cognitive Psychology
    • Visual Perception
    • Human-Computer Interaction

    Background:

    • Understanding how humans process directional information is crucial for designing effective visual displays.
    • Previous research suggests potential asymmetries in spatial processing, but direct comparisons of horizontal and vertical discrimination are limited.

    Purpose of the Study:

    • To compare the cognitive processing of directional cues (up/down vs. left/right arrows) in visual stimuli.
    • To investigate factors influencing the difficulty of discriminating between horizontal and vertical directions.

    Main Methods:

    • Five experiments were conducted using visual arrow stimuli presented in various orientations and positions.
    • Participants performed tasks requiring orientation or discrimination of arrow directions, using manual or verbal responses.

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    Main Results:

    • Discriminating left/right arrows is significantly more difficult than up/down arrows, irrespective of response modality.
    • Left-right discrimination tasks take longer than up-down tasks for both position and direction judgments.
    • Positional information can interfere with direction judgments, particularly across dimensions.

    Conclusions:

    • The human visual system exhibits greater difficulty in discriminating left from right compared to up from down.
    • Asymmetrical spatial coding for the left-right dimension may underlie this perceptual asymmetry.
    • Findings have implications for the design of user interfaces and visual information systems.