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Variable and intermittent grip force control in response to differing load force dynamics.

Francis M Grover1, Patrick Nalepka2, Paula L Silva3

  • 1Department of Psychology, Center for Cognition, Action, and Perception, University of Cincinnati, Edwards Center 1, Cincinnati, OH, 45221-0376, USA. groverfm@mail.uc.edu.

Experimental Brain Research
|December 14, 2018
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Summary
This summary is machine-generated.

Grip force control becomes more continuous when load forces are unpredictable. The temporal relationship between grip and load forces, and their coupling strength, vary significantly over time.

Keywords:
Grip force-load force couplingIntermittencyPredictabilityRecurrence quantification analysis

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Previous research indicated continuous grip force-load force coupling during object manipulation.
  • Grover et al. (2018) observed intermittent grip force coupling, challenging existing models.
  • This intermittency raises questions about the stability of grip force control and temporal relationships.

Purpose of the Study:

  • To investigate how load force predictability influences grip force control intermittency.
  • To determine the temporal consistency of the grip force-load force coupling.
  • To explore the impact of load force pattern complexity on grip force regulation.

Main Methods:

  • Analysis of grip force and load force oscillations during object manipulation.
  • Quantification of grip force-load force coupling strength and temporal lead/lag.
  • Examination of load force predictability and pattern complexity.

Main Results:

  • Grip force control exhibited increased responsiveness and continuity with decreased load force predictability.
  • The temporal relationship (lead/lag) between grip and load forces was found to be highly variable.
  • The strength of grip force-load force coupling demonstrated substantial fluctuations over time.

Conclusions:

  • Load force predictability is a critical factor modulating grip force control between intermittent and continuous modes.
  • Grip force control is not consistently coupled to load force; temporal dynamics are complex and variable.
  • Findings necessitate revisions to theoretical models of grip force control, incorporating dynamic temporal aspects.