Motor adaptation in deaf and hearing native signers

Area of Science:

• Neuroscience
• Motor Control
• Auditory Neuroscience

Background:

• Previous research suggested potential motor skill deficits in deaf individuals.
• Existing studies lacked homogeneity in language background and deafness causes, limiting clear conclusions.
• The relationship between deafness, sign language acquisition, and motor abilities requires further investigation.

Purpose of the Study:

• To investigate motor learning in deaf native signers compared to hearing nonsigners.
• To differentiate the effects of deafness from those of acquiring a signed language by including hearing native signers.
• To assess if deafness impacts motor adaptation and proprioception.

Main Methods:

• Two motor learning paradigms were used: adapting to visual feedback rotation and adapting to a force field.
• Participants included deaf native signers, hearing nonsigners, and hearing native signers.
• Proprioceptive estimates were measured before and after motor adaptation tasks.

Main Results:

• Deaf and hearing signers demonstrated robust motor adaptation, similar to hearing nonsigners.
• No significant differences in motor adaptation or memory were found between deaf signers and hearing nonsigners.
• No significant differences were observed between hearing signers and hearing nonsigners, nor in proprioceptive accuracy across groups.

Conclusions:

• Deafness does not inherently lead to deficits in motor skills or body-related abilities.
• Motor learning capabilities are preserved in deaf native signers.
• Findings suggest that sign language acquisition does not negatively impact motor learning compared to spoken language.