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Psychology literally means study of the soul from antiquity to the eighteenth century, Santo tomas (1225-1274) based on Aristotle defines the soul as the immediate principle in which all our operations find origin, also says that the soul does not only make a body move but even that it exists.
Because the soul has two main faculties: intelligence and will, which order and regulate our behavior. The body is nothing more than a fragment of matter to which the soul brings life. He follows his orders meekly and without her it is nothing. For this reason physics, mechanics and astronomy were applied.
Psychology is a young science that for many centuries was only a branch of metaphysical knowledge and then also free of philosophy. Giving place to the creation of several schools where division, tensions and dogmatisms were remarkable, in which it has left the comforting laboratory to face reality, overcoming sectarianism.
It is currently in a period of unification somewhat eclectic, acceptance of scientific results whatever their origin, and collaboration, on the level of equality with other disciplines.
Later Descartes explained that the existence of a hypothetical mechanism is due to the pineal gland of man, through which communication is made.
To which David Hume replied that was only achieved thanks to mental activities based on a model analogous to the Newtonian attraction, ie complex ideas are attracted and associated with each other according to certain well-defined laws .
Consecutively, Watson conducted objective studies of the reactions observing that an organism executes in response to stimuli, equally observable in the environment, and succeeds in fusing an objective psychology based on experimentation and on the externally observable behavior.
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In similarity with this, psychology tends to unify its theoretical differences to broaden its fields of practical application. Likewise tends to worry about creating a good conscience, and for collaborating with other sciences on a plane of equality such as anthropology, sociology, linguistics, logic, in studies of intelligence and language, medicine, neurology, and chemistry, in the basic physiological processes in the field of psychopharmacology and pedagogy, which are sciences that today work fruitfully in various fields of psychology research, helping without doubt to expand the perspectives of the specialists of human sciences and maximum concern of the current scientific world.