This book reconstructs the theory of signification implicit in Aristotle's De Interpretatione and its psychological background in his writing De Anima, a project often envisioned by scholars but never systematically undertaken.

I begin by explaining what sort of phonetic material, according to Aristotle, can be a significans and a phone. To that end, I provide a physiological account of which animal sounds count as phone, as well as a psychological evaluation of the cognitive content of the phonai under consideration in De...