DOES CHAOS MAKE MAMMALIAN CALLS SOUND MORE ALARMING TO HUMAN LISTENERS?
Mammalian vocalisations are extremely diverse, and evolutionary approaches to understanding this diversity assume that much of their acoustic form maps onto their function, with specific features serving universal roles. Here, we hypothesize that nonlinear phenomena (i.e., deterministic chaos, sidebands, subharmonics, and frequency jumps), which make the voice perceptually rough or harsh, contribu