... type of call appears to represent the presence of eagles,another the presence of snakes, and yet another the presence of leopards. Notice that we are already talking here about asystem of representation ... provided and that these notionscan then be used, without circularity, as the basis of a natur-alistic account of the origin of mental content.16 The key ideahere is to appeal to the biological theory ... enhanced our ancestors’ chances of survival.Now, just as there has been selection for certain of the physiological traits of animals in the course of evolution, soalso, very plausibly, has there...