psycholinguistics

Language may refer either to the specifically human capacity for acquiring and using complex systems of communication, or to a specific instance of such a system of complex communication. The scientific study of language in any of its senses is called linguistics.

Psychology is the study of the mind, occurring partly via the study of behavior.^[1][2] Grounded in scientific method,^[1][2] psychology has the immediate goal of understanding individuals and groups by both establishing general principles and researching specific cases,^[3][4] and for many it ultimately aims to benefit society.^[5][6] In this field, a professional practitioner or researcher is called a psychologist, and can be classified as a social scientist, behavioral scientist, or cognitive scientist. Psychologists attempt to understand the role of mental functions in individual and social behavior, while also exploring the physiological and neurobiological processes that underlie certain cognitive functions and behaviors.

Psycholinguistics or psychology of language is the study of the psychological and neurobiological factors that enable humans to acquire, use, comprehend and produce language. Initial forays into psycholinguistics were largely philosophical ventures, due mainly to a lack of cohesive data on how the human brain functioned. Modern research makes use of biology, neuroscience, cognitive science, linguistics, and information theory to study how the brain processes language.

Reference ;

http://en.wikipedia.org/wiki/Language]

http://en.wikipedia.org/wiki/Psychology

http://en.wikipedia.org/wiki/Psycholinguistics