of attention. Because of these problems, many psychologists began to shift their attention from mental states to mental processes. This change of thought was preceded by a change in the whole conception of what psychology is.

Three parts ushered functional psychology into the modern-day psychology. Utilizing the Darwinian ideology, the mind was considered to perform a diverse biological function on its own and can evolve and adapt to varying circumstances. Secondly, the physiological functioning of the organism results in the development