What are we trying to do and why are we trying to do it? We seek the origin of something we call language. What is it we are seeking the origin of? Say the expression of some internal process, the internal reception of some externally-perceived structured activity, speaking, hearing, understanding. A relation between what is going on 'in our heads' and a bodily activity of ours perceivable by others and interpretable by them. A relation between a perceivable activity of others and what subsequently goes or in our heads. Language more specifically as words, and the patterns into which words can be combined (semantics and syntax, lexicon and grammar). Speech is different from language; gesture is different from language; written forms are different from language. Or say that speech is a part of language. Language is the capacity of one individual to alter, through structured sound emission, the mental organisation of another individual.