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Feedback control systems01:26

Feedback control systems

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
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Related Experiment Video

Updated: May 3, 2026

Force and Position Control in Humans - The Role of Augmented Feedback
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Fast feedback control involves two independent processes utilizing knowledge of limb dynamics.

Isaac Kurtzer1, Frédéric Crevecoeur, Stephen H Scott

  • 1Department of Biomedical Sciences, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, New York;

Journal of Neurophysiology
|January 31, 2014
PubMed
Summary
This summary is machine-generated.

The long-latency reflex in arm muscles integrates limb dynamics, combining background muscle activity and task demands. This sophisticated feedback control reflects the summation of two distinct processes for effective movement.

Keywords:
feedbacklong-latency reflexmultijoint dynamics

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Corrective muscle responses (50-100 ms) adapt to limb mechanics and environment.
  • The R2/3 response (long-latency reflex) integrates shoulder and elbow motion for dynamic interaction.
  • This reflex comprises activity-dependent and task-dependent components.

Purpose of the Study:

  • To investigate the relationship between limb dynamics knowledge and the two components of the R2/3 response.
  • To understand how background muscle activity and task vigor influence this reflex.

Main Methods:

  • Subjects performed tasks countering shoulder and/or elbow torque steps.
  • Manipulated background torque levels and target sizes to vary component recruitment.
  • Two experiments with different perturbation and condition parameters were conducted.

Main Results:

  • Both background torque and target size influenced the shoulder's R2/3 activity, showing knowledge of limb dynamics.
  • These factors independently impacted R2/3 activity, further supporting limb dynamics integration.
  • The findings indicate a summation of two processes contributing to upper limb feedback control.

Conclusions:

  • The R2/3 epoch reflects sophisticated upper limb feedback control.
  • This control mechanism involves the summation of activity-dependent and task-dependent processes.
  • Knowledge of limb dynamics is expressed through these combined feedback pathways.