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In this article I argue that gestures and speech are parts of the same psychological structure and share a computational stage. The argument is based on the very close temporal, semantic, pragmatic, pathological, and developmental parallels between speech and referential and discourse-oriented gestures. Most of the article consists of a description of these parallels. A concept that unites outer speech and gesture is the hypothesis of inner speech.
David McNeill (Mon,) studied this question.