Handedness patterns in deaf persons

Area of Science:

• Neuroscience
• Developmental Psychology
• Linguistics

Background:

• Handedness, the preference for using one hand over the other, is a complex trait influenced by various factors.
• Previous research has explored the relationship between hearing status and handedness, with some studies suggesting differences.

Purpose of the Study:

• To investigate handedness patterns in deaf versus hearing student populations.
• To explore potential correlations between handedness, family history of deafness, and age of sign language acquisition in deaf individuals.

Main Methods:

• Comparison of handedness data (questionnaire and performance tests) between deaf and hearing college students.
• Analysis of family history of deafness and age of sign language introduction among deaf participants.

Main Results:

• Both deaf and hearing groups predominantly exhibited right-handedness.
• A significantly higher incidence of left-handedness was observed in the deaf student group compared to the hearing group.
• Left-handed deaf students were less likely to have deaf relatives and had later sign language acquisition.

Conclusions:

• The age of language acquisition appears to be a significant factor in the development of handedness patterns.
• Auditory processing experience is unlikely to be the primary driver of handedness differences observed in deaf individuals.