The concept of communication includes all of those processes by which people influence one another... This definition is based on the premise that all actions and events have communicative aspects, as soon as they are perceived by a human being; it implies, futhermore, that such perception changes the information which an individual processes and therefor influences him.

p. 6 as cited in: Stewart L. Tubbs, Robert M. Carter (1978) Shared Experiences in Human Communication. p. 1 - Communication: The Social Matrix of Psychiatry, 1951