Animal machine

This article is about the philosophical concept. For the 1964 book on intensive farming, see Animal Machines.

Animal machine (French: bête-machine), also known as animal automatism, is a philosophical concept most closely associated with 17th-century philosopher René Descartes, who argued that non-human animals are automata—complex, self-moving biological machines devoid of thought, reason, consciousness, or immaterial souls. As part of his philosophy of mind–body dualism, Descartes drew a sharp metaphysical boundary between humans, who he saw as possessing immaterial minds capable of rational thought and language, and animals, whose behaviors he attributed entirely to mechanical processes. These included the arrangement of physical organs, the flow of animal spirits, and responses to external stimuli, all governed by the same laws of motion that apply to inanimate matter.

Developed in opposition to the prevailing Aristotelian and Scholastic view that living beings possess souls and act for final causes, the concept of the animal machine represented a radical mechanization of life. It became central to Descartes' natural philosophy, shaping his explanations of sensation, movement, and bodily functions in both animals and humans. The doctrine provoked widespread criticism and debate, particularly regarding the apparent intelligence, adaptability, and suffering of animals. Nevertheless, it laid the groundwork for later philosophical discussions on animal cognition, consciousness, artificial intelligence, and the mechanistic interpretation of nature in early modern science.

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