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A shared neural integrator for human posture control.

S E Haggerty¹, A R Wu², K H Sienko^3,2

¹Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan; and.

Journal of Neurophysiology

|April 28, 2017

Summary

This summary is machine-generated.

Posture control integrates sensory information using a shared neural integrator, enhancing stability. This filter improves responses to visual and vestibular stimuli, crucial for maintaining balance.

Keywords:

galvanic vestibular stimulus neural integrator optokinetic postural control

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Area of Science:

Neuroscience
Biomechanics
Sensory Integration

Background:

Standing posture relies on integrating visual, vestibular, and somatosensory inputs, each with unique temporal dynamics.
The central nervous system uses a neural integrator for visual-vestibular reflexes to maintain gaze stability despite sensor decay.
The role of similar filtering mechanisms in posture control dynamics remains largely untested.

Purpose of the Study:

To investigate the presence and function of a shared neural integrator in human postural control.
To test the hypothesis that a neural integrator contributes to the temporal dynamics of postural responses.

Main Methods:

Developed a computational model of postural control incorporating direct sensory weighting and an indirect pathway with a neural integrator.
Applied classic sensory perturbations: rotating optokinetic stimulus (visual) and galvanic vestibular stimulus (vestibular) to healthy adult subjects (N=16).
Measured postural responses, specifically lateral trunk tilt, to compare model predictions with experimental data.

Main Results:

A direct sensory weighting model alone could not adequately explain the observed postural transients.
The model incorporating a shared neural integrator accurately reproduced the dynamics of postural responses to both optokinetic and galvanic vestibular stimuli.
Experimental data from healthy subjects supported the necessity of a neural integrator for accurate postural control.

Conclusions:

Postural control likely involves both direct sensory pathways and indirect pathways featuring a shared neural integrator.
This neural integrator filters and harmonizes sensory signals, facilitating effective sensory fusion for maintaining upright stance.
The findings highlight a conserved mechanism for temporal filtering across different sensory systems involved in sensorimotor control.