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Spatial S-R compatibility with orthogonal stimulus-response relationship.

W H Ehrenstein, P Schroeder-Heister, G Heister

    Perception & Psychophysics
    |March 1, 1989
    PubMed
    Summary
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    Spatial stimulus-response compatibility was studied using unimanual two-finger reactions. Findings show that spatial coding, not fixed anatomical mapping, influences compatibility effects.

    Area of Science:

    • Cognitive Psychology
    • Human Factors Engineering
    • Neuroscience

    Background:

    • Spatial stimulus-response (S-R) compatibility is crucial for efficient human-computer interaction.
    • Understanding the factors influencing S-R compatibility aids in designing intuitive interfaces.

    Purpose of the Study:

    • To investigate spatial S-R compatibility with unimanual two-finger choice reactions.
    • To examine how the spatial orientation of response keys affects compatibility.
    • To explore the underlying mechanisms of spatial coding and spatio-anatomical mapping.

    Main Methods:

    • Participants performed unimanual two-finger choice reactions to visual stimuli.
    • Response keys were arranged parallel and perpendicular to stimulus orientation.
    • Reaction times were measured under different key orientations and hand postures.

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    Main Results:

    • A standard spatial S-R compatibility effect was observed when keys were parallel to stimuli.
    • Compatibility effects persisted even with perpendicular key orientations (Conditions B and D).
    • A reversed compatibility effect emerged when keys were oriented palm-up (Condition C), suggesting flexible mapping.

    Conclusions:

    • The left/right finger distinction does not rely on a fixed spatio-anatomical mapping.
    • Spatial coding plays a significant role in spatial S-R compatibility.
    • A hierarchical model of spatial S-R compatibility, incorporating spatial coding and mapping flexibility, is supported.