Why there aren't right-handed apes

October 16, 2007

According to [Corballis's] theory, communicative (as opposed to merely expressive) behavior began with bipedalism, freeing the hands for use in communication. Corballis argues that this communicative behavior may have slowly shifted towards facial movements, and that the final stages in the evolution of spoken language involved the addition of voicing to those 'facial gestures.' Handedness emerged as vocalization was incorporated into manual gesture, extending the left-hemispheric dominance for communication into manual control.

You should follow me on Twitter here