It's only when you fully appreciate what displacement means, how the absence of displacement is not just a casual feature of ACSs but a crucial defining feature of pre-human minds, that you can start getting the complete picture. — Bickerton, page 217 The unique environmental need selecting for a communication system capable for displacement in humans or our direct ancestors is not identified, but hypotheses include Bickerton's theory of small groups finding large herbivore carcasses, and needing the assistance from other small groups of humans to defend against other dangerous scavengers (large cats, hyenas) competing for the same source of food.
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