👉 In psychology, an interactionist theory is a cognitive model that posits that mental processes are primarily influenced by interaction between two or more factors. Interactionists argue that the brain's processing of information and its interpretation depend on the interactions among these factors. They also suggest that it is possible to manipulate external stimuli to influence the brain's responses to them, thereby changing the brain's internal state. The theory emphasizes the idea that mental processes are not simply a product of individual factors but rather the result of an