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The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task
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Response complexity and the latency of different movement patterns.

D J Glencross1

  • 1a Department of Psychology , The Flinders University of South Australia.

Journal of Motor Behavior
|August 20, 2013
PubMed
Summary

Response complexity, not force, impacts reaction time (RT). Increased complexity in organizing movement sequences significantly lengthens RT, but force or simple reversals do not affect it.

Area of Science:

  • Human motor control
  • Cognitive psychology
  • Movement science

Background:

  • Reaction time (RT) is a fundamental measure in understanding cognitive and motor processes.
  • Previous research has explored factors influencing RT, but the precise relationship between movement complexity and response latency requires further elucidation.

Purpose of the Study:

  • To investigate how varying levels of response complexity affect reaction time (RT).
  • To differentiate the impact of movement organization complexity from physical parameters like force on RT.

Main Methods:

  • Two experimental series manipulating arm movement complexity.
  • Complexity varied by force, movement distance/direction (reversing/continuing), and limb coordination.
  • Simple and two-choice reaction time tasks were employed.

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Last Updated: May 8, 2026

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Published on: May 3, 2018

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An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

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Main Results:

  • Increased complexity in organizing spatio-temporal sequences of response units led to a corresponding increase in latency.
  • Altering the amount of force exerted did not significantly affect reaction time.
  • Simple reversal movements also did not show a significant impact on latency.

Conclusions:

  • Response organization complexity is a critical determinant of reaction time.
  • Physical force and simple movement reversals are less influential on RT than the cognitive demands of sequencing movement components.