Jeffery also suggests that definitions should precede explanatory theories. In these essays I have therefore tried to define my technical terms, where they differ from the dictionary meaning. My biggest problem has been how to define self-conscious awareness. It is a biological system. The subjective terms used in neuroscience are only approximate.
Objective events appear to be members of familiar classes.
Perceived events are almost always familiar events. Real objects are physically labeled or they can't be perceived. Labels imply categories with distinct boundaries or functions. Knowing something means imposing convenient boundaries upon it. Knowing something means giving it a name or label.