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Repetitive finger force production in predictable environments.

Amanda S Therrien1, James Lyons, Ramesh Balasubramaniam

  • 1Sensorimotor Neuroscience Laboratory, McMaster University, Hamilton, ON, Canada.

Neuroscience Letters
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

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Removing visual feedback during force production tasks causes errors. These errors, known as the force escalation effect, occur because the brain perceives self-generated forces as weaker, leading to overproduction.

Area of Science:

  • Motor Control
  • Human Movement Science
  • Neuroscience

Background:

  • Removal of visual feedback in force production tasks leads to force escalation.
  • Central predictive mechanisms and reafference influence force perception and production.
  • The force escalation effect in sequential discrete force production is not well-studied.

Purpose of the Study:

  • To investigate the force escalation effect in sequential force production.
  • To examine force production in predictable increasing and decreasing target force environments.
  • To understand the role of central predictive mechanisms in force magnitude errors.

Main Methods:

  • Eight healthy participants performed repetitive pinch grip forces at 2 Hz.
  • Visual feedback of force output was removed after 10 seconds for 20 seconds.

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  • Participants produced forces in environments with progressively increasing or decreasing targets (8-16 N).

    • Main Results:

    • Following visual feedback removal, participants rapidly accrued force magnitude errors.
    • The slopes of peak force series did not significantly differ from target series slopes.
    • Errors were bidirectional, depending on whether the target force was increasing or decreasing.

    Conclusions:

    • The force escalation and de-escalation effects are attributable to central predictive mechanisms.
    • The force salience effect in reafference contributes to these observed force production errors.
    • Predictable changes in target force influence the direction and magnitude of force errors.