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Response amendment latencies during discrete arm movements.

L G Carlton1, M J Carlton

  • 1Department of Physical Education, University of Illinois, 906 S. Goodwin, Urbana, Illinois 61801, USA.

Journal of Motor Behavior
|June 1, 1987
PubMed
Summary
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Movement modification speed depends on muscle activation. Continue instructions are faster early in movement, while reversal instructions are faster later, impacting amendment latencies.

Area of Science:

  • Motor control
  • Human movement science
  • Neuroscience

Background:

  • Rapidly modifying ongoing movements is crucial for daily activities.
  • Previous research indicates faster reaction times for increasing movement velocity compared to reversing movement.
  • The influence of muscle activation state on movement modification has not been fully elucidated.

Purpose of the Study:

  • To investigate the hypothesis that amendment latencies for both continuing and reversing movements are dependent on the muscle activation state.
  • To determine how the timing of visual stimuli affects amendment latencies for different movement modification instructions.

Main Methods:

  • Participants performed discrete arm movements.
  • Visual stimuli (continue or reverse instructions) were presented at four distinct phases of the movement.

Related Experiment Videos

  • Amendment latencies were measured in relation to modified electromyographic (EMG) patterns.

    • Main Results:

    • Amendment latencies for the 'continue' instruction were shortest when the stimulus was presented early in the movement.
    • Amendment latencies for the 'reverse' instruction showed the opposite trend, with longer latencies when the stimulus was presented early.
    • These findings suggest a direct relationship between the active state of the motor system and amendment latencies.

    Conclusions:

    • Amendment latencies are significantly influenced by the muscle activation state at the time of modification.
    • The nature of the required amendment (continue vs. reverse) interacts with the motor system's active state.
    • Understanding these dynamics is key to comprehending the neural control of rapid movement adjustments.