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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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Force and Position Control in Humans - The Role of Augmented Feedback
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Coordination between digit forces and positions: interactions between anticipatory and feedback control.

Qiushi Fu1, Marco Santello

  • 1School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona.

Journal of Neurophysiology
|January 10, 2014
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Summary

Humans use visual cues for precise object manipulation, adjusting grip forces based on visual planning or haptic feedback. Without vision, force adjustments are delayed, relying on touch for correction.

Keywords:
feed-forward controlhaptic feedbackmanipulationvirtual realityvision

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Area of Science:

  • Human Motor Control
  • Robotics
  • Human-Computer Interaction

Background:

  • Humans naturally adapt grip forces to variations in object position during manipulation.
  • The interplay between visual feed-forward and haptic feedback control in this adaptation is not fully understood.
  • Understanding these mechanisms is crucial for designing intuitive human-robot interaction and prosthetic devices.

Purpose of the Study:

  • To investigate the temporal dynamics of visual and haptic control during object manipulation.
  • To determine how visual information influences feed-forward force planning versus haptic feedback correction.
  • To elucidate the time course of digit force adjustments when visual cues are absent.

Main Methods:

  • A virtual reality task simulating object manipulation with haptic feedback devices.
  • Participants generated torque on virtual objects of varying widths (large/small).
  • Visual cues regarding object width were manipulated (present/absent) to isolate control strategies.

Main Results:

  • Visual cues enabled pre-contact force planning for object manipulation.
  • In the absence of visual cues, a default force plan was adopted and corrected post-contact.
  • Haptic feedback alone required a 250-300 ms delay for appropriate digit force adjustments after contact.

Conclusions:

  • Both visually guided feed-forward and haptic-based feedback control contribute to digit position/force coordination.
  • Haptic feedback is sufficient for implementing digit force-position coordination, albeit with a temporal delay.
  • The findings provide insights into the neural mechanisms underlying sensorimotor control during interaction with objects.