The Cognitive Revolution in psychology was prompted by the Behaviorism movement. The Behaviorists focused their research primarily on observable behavior alone, completely disregarding any mental events because they couldn't be directly observed. Famous behaviorists include Ivan Pavlov and John Watson. Cognitive psychologists believe that the mind is complex and there are many different explanations for behavior. They tend to use a computer metaphor, with the hardware being what humans biologically have and the software being cognitions and patterns of thought. The cognitive revolution changed the world of psychology completely and helped shape it into the one we know today. Image source: http://www.creativitycenter.ch/bloc_deroulant/jean-piaget-and-genetic-ep...