Humanity's right-hand dominance might be more than 500,000 years old, new research indicates. The trait of right-handedness is commonly believed to be a sign of the development of another uniquely ...

When people are communicating in sign languages, they also move their mouths. But scientists have debated whether mouth movements resembling spoken language are part of the sign itself or are ...

Twins produce fewer gestures and gesture to fewer objects than other children. Language use also lags for twins, and language -- but not gesture -- is also affected by sex, with girls performing ...