The application of scientific methods to the study of mental processes and behaviour. This covers a wide range of fields of study including: human and animal learning in which learning theories describe how new behaviours are acquired and modified; cognition, the study of a number of functions, such as perception, attention, memory, and language; physiological psychology, which relates the study of cognition to different regions of the brain. Artificial intelligence refers to the computer simulation of cognitive processes, such as language and problem-solving.