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Related Experiment Videos

Distributed Control in Rapid Sequential Aiming Responses.

Ben Sidaway1, Dongwon Yook, Daniel Russell

  • 1Department of Physical Therapy, Husson College, Bangor, ME, 04401, USA. bsidaway@husson.husson.edu

Journal of Motor Behavior
|February 15, 2001
PubMed
Summary

This study investigated rapid sequential aiming responses. Movement initiation in reaction time (RT) tasks, but not self-initiated movements, showed a slower second segment, regardless of visual feedback.

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Area of Science:

  • Motor Control
  • Human Movement Science
  • Cognitive Psychology

Background:

  • Sequential aiming responses are fundamental to many daily activities.
  • Understanding the control mechanisms of rapid, multi-segment movements is crucial for fields like robotics and rehabilitation.

Purpose of the Study:

  • To examine the preparation and online control of short, rapid sequential aiming responses.
  • To investigate the influence of external cues versus self-initiation on movement execution.
  • To determine the role of visual feedback in the performance of sequential movements.

Main Methods:

  • Three experiments involving participants (N=12-20) performing 3-segment aiming responses.
  • Utilized self-initiation, simple reaction time (RT), and choice RT paradigms.

Related Experiment Videos

  • Manipulated the availability of visual feedback during movement execution.

    • Main Results:

    • A consistent slowing of the second response segment was observed under RT conditions when movement was externally triggered.
    • This slowing occurred irrespective of visual feedback availability.
    • The slower second segment was absent in self-initiated movements, with or without visual feedback.

    Conclusions:

    • Visual feedback is not the cause of the second segment slowing in RT tasks.
    • The programming of rapid sequential aiming responses appears to be distributed across pre- and post-initiation intervals.
    • Movement initiation context (external cue vs. self-initiation) significantly impacts response programming.