Enfield, N. J. (2008). Language as shaped by social interaction [Commentary on Christiansen and Chater]. Behavioral and Brain Sciences,31(5), 519-520. doi:10.1017/S0140525X08005104.
Language is shaped by its environment, which includes not only the brain, but also the public context in which speech acts are effected. To fully account for why language has the shape it has, we need to examine the constraints imposed by language use as a sequentially organized joint activity, and as the very conduit for linguistic diffusion and change.