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The "short-long" reaction time effect in duration programming.

F Vidal1, F Macar, M Bonnet

  • 1Laboratoire de Neuroscience Cognitive, Equipe Temps Centre National de la Recherche Scientifique, Marseille, France. Vidal@LNF.CNRS-MRS.FR

Journal of Motor Behavior
|December 1, 1996
PubMed
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This study reveals that motor programs include response duration. A "short-long effect" in reaction time (RT) suggests short durations are programmed first, with longer durations built upon them.

Area of Science:

  • Cognitive Psychology
  • Motor Control
  • Human Factors

Background:

  • Understanding how the brain plans and executes movements is crucial for fields like robotics and rehabilitation.
  • Reaction time (RT) paradigms are widely used to investigate the temporal aspects of motor programming.

Purpose of the Study:

  • To investigate the role of response duration in motor programming.
  • To examine how precueing and priming influence reaction time based on response duration.
  • To determine if response duration is pre-programmed before movement execution.

Main Methods:

  • Two experiments utilized reaction time (RT) paradigms: precueing and priming.
  • Participants performed motor responses of specified durations (.7, 2.5, 5.5 seconds) using different effectors (hands, knees).

Related Experiment Videos

  • Invalid trials were introduced in the priming experiment to test the flexibility of pre-programmed durations.

    • Main Results:

    • A significant 'short-long effect' was observed: reaction times were shorter for short durations when not precued.
    • This effect was consistent across different response types and effectors.
    • In priming experiments with invalid trials, no RT difference was found between short and long durations, supporting a distinct programming mechanism for short durations.

    Conclusions:

    • Response duration is an integral component of the motor program, irrespective of biomechanical features.
    • A motor program for short durations appears to be a default, serving as a basis for programming longer durations.
    • Deprogramming operations may be necessary for short-duration responses, explaining longer RTs in certain conditions.