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The topical term is of Greek origin and means either an argument or idea is directly related to the subject discussed and whose it is, either a commonplace or even any medication applied on a sick part and which acts only at this location.
In Linguistics, the topical Word is wrongly used in french to designate so called 'theme', i.e., the portion of a statement which is given as the theme (as opposed to the comment), deemed known by the participants in the communication and which provides no new information. It is sort of a procedural language insofar as a person who employs a topical has low expressive resources, either a preference for repetition of the most common resources. Topicals are used often to hide the truth (especially in political discourse) or to simplify an idea.
In the field of psychoanalysis from Sigmund Freud, the topical said principle is one of the three aspects that metapsychology (psychoanalytic theory, more precisely) describes the psychic reality. This principle considers places (in the figurative sense), namely, the psychological instances. Freud has created two topical: the first topical (the conscious and the unconscious) and the second topical (the 'ca', 'me' and the 'superego'). The Neuropsychologist topicals are a theoretical mode that explains and represents the functioning of the human mind as a device having a spatial arrangement. They reflect the psychic conflict, so to speak.
For all the rhetoric, the topical concerns topos (or "common places"), i.e., the themes, the consensual assertions, ideas and common situations used thread in research and the choice of themes.
Finally, concerning medicine, a topical is a drug which the form of administration is local. In other words, it operates only on the specific point of the body (at a place of the skin or mucosal) where it is applied.