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Related Experiment Video

Updated: Jun 3, 2025

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

Published on: May 23, 2011

Hypergravity is more challenging than microgravity for the human sensorimotor system.

Loïc Chomienne¹, Patrick Sainton², Fabrice R Sarlegna²

¹Aix Marseille Univ, CNRS, ISM, Marseille, France. l.chomienne@gmail.com.

NPJ Microgravity

|January 10, 2025

Summary

This summary is machine-generated.

Human motor control adapts differently to gravity changes. Microgravity allows accurate reaching, while hypergravity causes undershooting due to challenges in sensorimotor system adaptation.

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Area of Science:

Neuroscience
Human Motor Control
Gravitational Physiology

Background:

The central nervous system's ability to adapt motor control to varying gravity is crucial for complex movements.
Understanding how the brain adjusts to microgravity and hypergravity is essential for space travel and terrestrial applications.

Purpose of the Study:

To investigate the distinct effects of microgravity and hypergravity on the neuromuscular control of reaching movements.
To test the hypothesis that different gravity levels elicit unique responses in sensorimotor planning and control.

Main Methods:

Participants (n=9) performed reaching movements towards visual targets during parabolic flights.
Whole-body kinematics and muscular activity were recorded to analyze motor adjustments.
Comparison of reaching accuracy and muscle activation patterns across microgravity, normogravity, and hypergravity conditions.

Main Results:

In microgravity, participants adjusted whole-body kinematics and muscle activity, achieving reaching accuracy comparable to normogravity.
In hypergravity, a consistent undershooting of targets was observed, suggesting insufficient reorganization of muscle activations.
The human sensorimotor system demonstrated difficulty in adapting to hypergravity challenges within the study's timeframe.

Conclusions:

Microgravity facilitates adaptation in reaching movements, maintaining accuracy through neuromuscular adjustments.
Hypergravity presents a significant challenge to the sensorimotor system, leading to impaired reaching performance due to inadequate adaptation.
Further research is needed to explore the long-term effects and underlying mechanisms of hypergravity on motor control and internal models of limb dynamics.