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Related Experiment Videos

Response preparation and control of movement sequences

I M Franks1, P Nagelkerke, M Ketelaars

  • 1University of British Columbia, School of Human Kinetics, Vancouver, Canada. ifranks@unixg.ubc.ca

Canadian Journal of Experimental Psychology = Revue Canadienne De Psychologie Experimentale
|September 17, 1998
PubMed
Summary

Response complexity impacts reaction time (RT). Complex movements like extension/flexion take longer than simple ones, but a sufficient pause allows preprogramming, reducing the RT difference.

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Area of Science:

  • Motor Control
  • Human Movement Science
  • Cognitive Psychology

Background:

  • The response complexity effect describes how the number of movement components influences reaction time (RT).
  • Understanding this effect is crucial for fields like sports science, rehabilitation, and human-computer interaction.
  • Previous research suggests increased complexity leads to longer RTs.

Purpose of the Study:

  • To investigate the response complexity effect in elbow extension/flexion movements.
  • To determine the role of pause duration at movement reversal on RT.
  • To examine the electromyographical (EMG) activity during complex movements with varying inter-movement intervals.

Main Methods:

  • Two experiments were conducted using elbow extension and flexion tasks.

Related Experiment Videos

  • Experiment 1 compared RT for simple extension versus combined extension/flexion.
  • Experiment 2 manipulated pause duration between movements and recorded EMG from triceps and biceps muscles.

    • Main Results:

    • RT for extension was significantly shorter than for extension/flexion in Experiment 1.
    • This RT difference disappeared when a 260 ms pause was introduced at movement reversal.
    • A reduced pause (75 ms) in Experiment 2 prevented programming the subsequent movement at reversal, increasing premotor RT.

    Conclusions:

    • The response complexity effect is modulated by the ability to program subsequent movements.
    • Sufficient inter-movement pause allows for preprogramming, mitigating RT differences.
    • Short pauses necessitate preprogramming earlier, impacting premotor RT and potentially movement execution.