Evolutionary biologist Richard Dawkins and zoologist John Krebs, in a now classic 1978 paper, point out that deceptive signaling is, itself, an evolutionary adaptation, a trait that developed in our earliest animal ancestors, to gain survival and reproductive benefits. (Think about how hostile mammalian and avian vocalizations are built upon size bluffing through lowered pitch and noisy growling — a “dishonest signal.”) According to Dawkins and Krebs, such false signaling is (a) found in all animal communication: the colors flashed by butterflies, the calls of crickets, the pheromones released by moths and ants, the body postures of lizards, and our acoustic signals. Nature is deceitful. Creatures will do what they can to not die — at least until they’ve (b) succeeded in winning a mate and passing along their genes.
But at the same time, Dawkins and Krebs tell us, the receivers of deceptive signals undergo their own coevolutionary “selection pressure” for detecting false communications. The coevolution of voice and ear initiated a biological “arms race.” The “manipulating” vocalizer evolves, over vast spans of evolutionary time, finer and finer means for faking, by (c) abandoning greater neurological control over the vocal apparatus. Meanwhile, the listener, who has his own survival concerns, gets (d) better at picking out the particular blend of pitch, rhythm, timbre and volume that marks the vocalizer as a deceiver. This (e) compels the sender to further refine his “manipulations,” which creates further pressure on the receiver to improve his acoustic “mindreading.”
* bluff: 허세 부리다 ** vocal apparatus: 발성 기관