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Is handedness recognition automatic? A study using a Simon-like paradigm.

Giovanni Ottoboni1, Alessia Tessari, Roberto Cubelli

  • 1Istituto di Psicologia, Università di Urbino, Urbino, Italy. giovanni.ottoboni@uniurb.it

Journal of Experimental Psychology. Human Perception and Performance
|September 1, 2005
PubMed
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This study investigated automatic handedness recognition using a modified Simon task. Results indicate the brain automatically processes hand position relative to the body, not inherent handedness.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Perception

Background:

  • The Simon task is a well-established paradigm for studying response conflict and spatial attention.
  • Previous research has explored various factors influencing the Simon effect, but the automatic processing of hand laterality remains debated.

Purpose of the Study:

  • To investigate whether the brain automatically recognizes handedness or processes the spatial relationship between a hand stimulus and the body.
  • To examine how different visual presentations of hands (e.g., back view, palm view, with or without body context) affect the Simon effect.

Main Methods:

  • A modified Simon task was employed, where participants responded to a central color cue presented alongside images of hands.
  • Stimuli included images of left and right hands in various orientations and contexts (e.g., detached at the wrist, connected to a forearm or body).

Related Experiment Videos

  • Reaction times and accuracy were measured to assess the presence and direction of the Simon effect.

    • Main Results:

    • A regular Simon effect was observed for back-hand views, suggesting spatial compatibility.
    • A reverse Simon effect was found for palm-hand views, indicating a different processing mechanism.
    • The Simon effect persisted when forearms or body images were present, but disappeared when hands were detached at the wrist.

    Conclusions:

    • The findings suggest that the automatic processing is related to the hand's spatial position relative to an imagined or real body, rather than an inherent recognition of handedness.
    • This challenges the notion of automatic handedness encoding and highlights the role of body-related spatial frames of reference in perception.