In addition to different media of communication via various senses, they could also be categorized in terms of the biological aspects. They could be divided into implicit and explicit non-verbal communication. The former were changes in a person that were non-muscle in nature; i.e., they were not movements in the body caused by the muscular system. To put more simply, they were, for example, not caused by moving a muscle in the arm.
These changes included variations in body temperature, heart rate, perspiration, and respiration. Non-verbal communication could also be thought of as voluntary and non-voluntary.
With so many facets and aspects of non-verbal communication, categorizing it in his head when he recorded it mid-fight was extremely important.
Thus, one of the most important requirements of the system of thought for Project Telepath was categorization and organization.
