Behavioral and Brain Sciences

open peer commentary

the cerebral torque and directional asymmetry for hand use are correlates of the capacity for language in homo sapiens

timothy j. crow a1
a1 sane prince of wales international centre, warneford hospital, oxford ox3 7jx, united kingdom


the claim of consistent hemispheric specialisations across classes of chordates is undermined by the absence of population-based directional asymmetry of paw/hand use in rodents and primates. no homologue of the cerebral torque from right frontal to left occipital has been established in a nonhuman species. the null hypothesis that the torque is the sapiens-specific neural basis of language has not been disproved.