The main premise of this article is that various cognitive functions involved in signal analysis, memory, and decision making, all modulated by the animal's internal milieu, can generate selection for the forms of signals used in social interactions. Thus, just as an animal's view of its world, its Umwelt, determines how it interacts with its ecological niche, it can influence the evolution of its social niche. Thus, the brain is not only a landscape on which selection can act, but also it is a powerful source of selection on the animal's social niche.
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