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Related Experiment Video

Updated: Jul 10, 2026

Measurement of Spatial Stability in Precision Grip

Measurement of Spatial Stability in Precision Grip

Published on: June 4, 2020

Grip force control of predictable external loads.

J Hermsdörfer¹, H Blankenfeld

¹Clinical Neuropsychology Research Group (EKN), Academic Hospital Munich-Bogenhausen, Technical University of Munich, Munich, Germany. Joachim.Hermsdoerfer@extern.lrz-muenchen.de

Experimental Brain Research

|November 9, 2007

Summary

This summary is machine-generated.

Healthy subjects can predict external loads with practice, shifting from reactive to predictive grip force control. However, performance stability and precision did not match self-produced loads, highlighting the role of motor command efference copy.

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Last Updated: Jul 10, 2026

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Area of Science:

Neuroscience
Motor Control
Human Physiology

Background:

Predictive feedforward control precisely modulates grip force with self-produced loads.
It remains unclear if externally produced, predictable loads can be anticipated with similar feedforward precision.

Purpose of the Study:

To investigate if humans can predict and adapt grip force control to externally produced sinusoidal loads.
To compare performance with self-produced loads and assess learning retention.

Main Methods:

Eight healthy subjects repeatedly compensated for externally produced sinusoidal loads (1.5s cycle).
Grip force-load coupling timing and precision were analyzed across practice sessions, retention tests, and compared to self-produced loads.

Main Results:

Grip force-load time lag decreased with practice, indicating a shift towards predictive control.
Grip force control precision and economy did not improve significantly with external load practice.
Performance after practice was less precise and stable than with self-produced loads, with limited retention.

Conclusions:

Periodic external loads can be controlled by predictive feedforward mechanisms after practice.
Sensorimotor processing of external loads may rely on efferent copies of motor commands.
Self-produced loads demonstrate superior grip force control precision compared to external loads.