Motor imagery helps updating internal models during microgravity exposure.

Area of Science:

• Neuroscience
• Motor Control
• Human Factors

Background:

• Skilled movements rely on internal models integrating feedforward and feedback mechanisms for execution and imagery.
• Motor imagery is thought to update feedforward mechanisms, enhancing performance in familiar settings.
• The adaptability of motor imagery in radically new environments remains largely unexplored.

Purpose of the Study:

• To investigate whether motor imagery can update internal models of movement in unfamiliar gravitational conditions (microgravity).
• To determine if mere exposure to microgravity is sufficient to alter internal representations of movement.
• To compare the effects of motor imagery versus passive exposure on motor adaptation.

Main Methods:

• Participants performed and imagined arm pendular movements in normal gravity and microgravity during parabolic flights.
• Three groups were involved: a ground control, a microgravity-exposed group without imagery, and a microgravity-exposed group with imagery.
• Movement durations of actual and imagined tasks were recorded before and after flight exposure.

Main Results:

• The group that imagined movements in microgravity showed updated internal representations of gravity, altering imagined movement duration.
• Mere exposure to microgravity without motor imagery did not induce significant changes in imagined movement duration.
• Motor imagery in microgravity was sufficient to update internal models, whereas passive exposure was not.

Conclusions:

• Motor imagery plays a crucial role in updating internal representations of movement in unfamiliar environments.
• Passive exposure to altered gravity is insufficient for adapting internal models of movement.
• Executing a task is not a prerequisite for updating graviception; motor imagery suffices.