ABSTRACT
This chapter presents the most important concepts of consciousness and explains how they are defined in the current science of consciousness. It discussed the three concepts: phenomenal consciousness, reflective consciousness, and self-awareness should always be clearly distinguished from each other in the science of consciousness. The definitions in current consciousness science divide consciousness into phenomenal, reflective, access, and self-aware types of consciousness. The scientific vocabulary describing consciousness has developed recently to the extent that most consciousness scientists now agree about the basic phenomena that will have to be clearly described and separated from each other in the science of consciousness. Phenomenal consciousness is the most fundamental kind of consciousness. All the other types of consciousness are dependent on phenomenal consciousness. In the philosophy of consciousness, creatures that externally appear conscious but are internally devoid of any consciousness are called zombies.
