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Effects of response sequence length on motor programming: a chronometric analysis.

Hannes Schröter1, Hartmut Leuthold

  • 1Cognitive and Biological Psychology, University of Tübingen, Friedrichstrasse 21, 72072 Tübingen, Germany. hannes.schroeter@uni-tuebingen.de

Acta Psychologica
|February 5, 2008
PubMed
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Response sequence programming is affected by context. Motor activation precedes full program establishment, impacting reaction time (RT) in blocked but not mixed tasks.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Factors

Background:

  • Understanding how context influences motor sequence programming is crucial for explaining human behavior.
  • Choice reaction time (RT) tasks are widely used to investigate cognitive and motor processes.

Purpose of the Study:

  • To investigate the impact of choice response context on the programming of response sequences.
  • To determine the locus of sequence length effects using behavioral and electrophysiological measures.

Main Methods:

  • Participants performed 1-key vs. 3-key responses with either hand in a choice RT task.
  • Response context was manipulated via blocked vs. mixed execution of different sequence lengths.
  • Behavioral RT and electrophysiological data (Lateralized Readiness Potential) were collected.

Related Experiment Videos

Main Results:

  • A sequence length effect on RT was observed in the blocked condition but not in the mixed condition.
  • The time course of the Lateralized Readiness Potential indicated a motoric locus for the sequence length effect.
  • Findings suggest response hand activation occurs before the complete motor program is established.

Conclusions:

  • Response sequence programming is context-dependent, with blocked execution revealing sequence length effects.
  • Electrophysiological data support a motoric explanation for sequence length effects, highlighting early hand activation.
  • These findings advance our understanding of motor control and cognitive-behavioral interactions.