Handwriting posture as related to cerebral speech lateralization, sex, and writing hand

The claim that handwriting posture can provide clues to the cerebral lateralization of language was investigated in a sample of 131 patients undergoing preoperative intracarotid injections of sodium amobarbital to determine the side of speech representation. More males than females inverted the left hand when writing, but no consistent relationship was found between speech lateralization and handwriting posture. These results suggest that perceptual asymmetries correlated with hand posture vary independently of cerebral dominance for speech.