"The schism in cognitive science between those who follow the computer model and those who think language is enough in itself is widening. This book is timely and may sway some of the doubters."I particularly liked the way that the author focussed on Fodor's exemplary version of the 'language of thought' thesis. Also, it cannot be emphasized enough that Wittgenstein's account of all normative practices requires that there be natural or trained regularities in place before linguistic or other normative practices can be acquired. The consequential step that Wittgenstein makes, of developing a psychology of skills, is well brought out. The book is not only a contribution to the field of developmental psycholinguistics, but to Wittgenstein scholarship." — Rom Harré, Oxford and Georgetown Universities