Optimizing Movement Performance with Altered Sensation: An Examination of Multisensory Inputs

Area of Science:

• Neuroscience
• Motor Control
• Human Movement Science

Background:

• Somatosensory feedback, including proprioception, is vital for accurate motor control.
• Disruptions to somatosensory input can significantly impact goal-directed movements.
• Understanding compensatory mechanisms is key to addressing motor deficits.

Purpose of the Study:

• To investigate the effects of induced paresthesia on aiming movement parameters.
• To determine if visual and auditory feedback can mitigate performance decrements during disrupted somatosensory feedback.
• To assess motor adaptability to altered somatosensory input.

Main Methods:

• Neurotypical adults performed a goal-directed aiming task under conditions of induced paresthesia and varying visual feedback (full vision, no vision).
• Paresthesia was induced using a constant current stimulator, and vision was occluded with special spectacles.
• Experiment 2 incorporated auditory feedback for successful target acquisitions.

Main Results:

• Induced paresthesia, especially without vision, led to significantly greater endpoint error toward the body midline.
• Visual feedback alone could not fully compensate for disrupted proprioceptive input.
• Auditory feedback in Experiment 2 improved endpoint variability during induced paresthesia by altering movement preparation.

Conclusions:

• Proprioceptive input is essential for maintaining movement accuracy when visual feedback is limited.
• While vision is insufficient to fully restore performance with compromised proprioception, auditory cues can aid motor adaptation.
• Movement preparation strategies can be modulated to improve performance despite somatosensory disruption.