Representation is a term used in cognitive psychology, neuroscience, and cognitive science to refer to a hypothetical internal cognitive symbol that represents external reality. Cognitive psychology is a branch of Psychology that investigates internal mental processes such as problem solving memory and language Neuroscience is a field devoted to the scientific study of the nervous system Cognitive science may be broadly defined as the multidisciplinary study of mind and behavior The musical instrument is spelled Cymbal. A symbol is something --- such as an object, Picture, written word a sound a piece David Marr defines representation as "a formal system for making explicit certain entities or types of information, together with a specification of how the system does this. David Courtnay Marr ( January 19, 1945 - November 17, 1980) was a British Neuroscientist and Psychologist. "[1] Representationalism (also known as indirect realism) is the view that representations are the main way we access external reality. Representative Theory of Perception, also known as Indirect realism, epistemological dualism, and The veil of perception, is a philosophical Representative Theory of Perception, also known as Indirect realism, epistemological dualism, and The veil of perception, is a philosophical