Fast corrective responses are evoked by perturbations approaching the natural variability of posture and movement tasks

Journal of Neurophysiology
F CrevecoeurStephen H Scott

Abstract

A wealth of studies highlight the importance of rapid corrective responses during voluntary motor tasks. These studies used relatively large perturbations to evoke robust muscle activity. Thus it remains unknown whether these corrective responses (latency 20-100 ms) are evoked at perturbation levels approaching the inherent variability of voluntary control. To fill this gap, we examined responses for large to small perturbations applied while participants either performed postural or reaching tasks. To address multijoint corrective responses, we induced various amounts of single-joint elbow motion with scaled amounts of combined elbow and shoulder torques. Indeed, such perturbations are known to elicit a response at the unstretched shoulder muscle, which reflects an internal model of arm intersegmental dynamics. Significant muscle responses were observed during both postural control and reaching, even when perturbation-related joint angle, velocity, and acceleration overlapped in distribution with deviations encountered in unperturbed trials. The response onsets were consistent across the explored range of perturbation loads, with short-latency onset for the muscles spanning the elbow joints (20-40 ms), and long-latency for sho...Continue Reading

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Citations

Jun 28, 2013·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Michael DimitriouDavid W Franklin
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Apr 2, 2015·Current Opinion in Neurobiology·Stephen H ScottTomohiko Takei
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Related Concepts

Kinematics
Elbow
Elbow Joint Structure
Surface Electromyography
Postural Balance
Shoulder
Joint Structure of Shoulder Region
Soleus Muscle Structure
Torque
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