Connectionism is a theory of mind that involves neuronal networks in the brain working together to support cognition. It can be applied to fields like artificial intelligence and neuroscience. Connectionist ideas date back to Aristotle but have evolved with technology. New connectionist theory recognizes the multiple inputs and outputs of individual neurons. The brain's organization parallels attempts to imitate life in artificial intelligence. Connectionism informs models of language processing and acquisition that influence clinical practice in speech and language therapy.