Left Brain Talks To The Right Hand, Study Finds

The finding, published in the Proceedings of the National Academy of Sciences, suggests that our brains are hard-wired to process gestures and speech and language on the same side of the brain. For right-handed people, that's usually the left side.

It also supports the view that speech arose from a combination of short sounds and hand gestures that were intended to communicate something. Those gestures probably would have been carried out by the right hand, since that is usually the dominant hand.

There's lots of other evidence that gestures were involved in early language, says David Armstrong,