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Adaptation to delayed force perturbations in reaching movements.

Noa Levy¹, Assaf Pressman, Ferdinando A Mussa-Ivaldi

¹Department of Biomedical Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel.

|August 17, 2010

Summary

The brain can adapt to delayed robotic forces during reaching movements. This motor adaptation shows the brain

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Area of Science:

Neuroscience
Motor Control
Robotics

Background:

Motor adaptation to force fields is crucial for daily activities.
Previous studies focused on immediate force perturbations.

Purpose of the Study:

Investigate brain adaptation to delayed velocity-dependent force fields.
Determine if the motor system can predict delayed sensory-motor perturbations.

Main Methods:

Two groups performed reaching movements under immediate or delayed force fields.
Measured kinematic data during adaptation and catch trials.

Main Results:

Subjects adapted to delayed force perturbations.
Catch trial deviations indicated temporal expectation of the delayed field.
Adaptation to delayed forces demonstrates temporal flexibility in motor prediction.

Conclusions:

The brain can adapt to time-delayed sensory-motor feedback.
Motor adaptation prediction has a flexible temporal window.
Findings are relevant for understanding sensory-motor variability compensation.

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