It is the ability to speak, emerged probably in a period between 100,000 and 50,000 years ago, that has marked more than any other event our transformation in modern humans capable to interact among ourselves and with the surrounding reality to the highest degree.

Words have deep connections with human musculature. Many scientists think that the capability of speaking has emerged, at least in part, from the physical movements of primates and the first human beings.
Gestures, expressions, positions, and other fine or rough actions. In a way that is still not clear, linguistic structure can arise from and can even be seen as a special case of motor structure, the structure of action (Studdert-Kennedy, 1983).

Similarly, our inner ability to elaborate the words and the syntax into mental thought can emerge from our capability to handle physical objects. Words that were originally attributes of the objects are more and more managed and joined, like real objects are handled by a child (Wilson, 1998, p. 193). Modern research indicates the existence of a strong neurological basis supporting the connection between physical movement and speech.