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Perception of Interdependent Finger Forces During a Bimanual Finger Pressing Task.

Valters Abolins1, Edgars Bernans2, Cristian Cuadra3,4

  • 1Institute of Occupational Safety and Environmental Health, Riga Stradins University, Riga, Latvia.

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Unintentional forces from adjacent fingers impair force perception accuracy. Matching tasks show improved accuracy when considering the total force, not just the independent component.

Keywords:
enslavingfinger individuationfinger interdependenceforce perception

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Area of Science:

  • Neuroscience
  • Motor Control
  • Sensory Perception

Background:

  • Force perception integrates sensory and motor signals.
  • Involuntary forces from adjacent fingers impact force feedback.
  • The effect of these interdependent forces on proprioception is not well understood.

Purpose of the Study:

  • To investigate the perception of unintentional interdependent forces during finger pressing.
  • To compare the accuracy of perceiving interdependent forces versus voluntary forces.
  • To explore the influence of visual feedback on force perception variability.

Main Methods:

  • Experimental within-subject design with 12 participants.
  • Bilateral finger-pressing tasks involving a reference and an interdependent force.
  • Contralateral force matching of involuntary forces, with and without visual feedback.

Main Results:

  • Perception of interdependent forces was significantly less accurate than voluntary forces.
  • Matching accuracy improved when participants perceived the summed force (instructed + interdependent).
  • Force perception variability increased without visual feedback, while visual cues reduced it.

Conclusions:

  • Unintentional interdependent forces negatively impact perceptual accuracy.
  • Weaker coupling between motor commands and sensory feedback likely underlies this impairment.
  • Perceptual judgments are biased towards the total force generated, not isolated components.