In Antoniana Margarita opus nempe Physicis, Medicis, ac Theologis Gómez Pereira enunciates new philosophical theories, precursors of those that Descartes would Later spread in his works. Perhaps the best-known theory of those collected in this work is that of the automatism of beasts, the basis of modern physiology, which defends that animals have neither a “rational” nor a “sensitive” soul.