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When getting into comparing consciousness and unconsciousness the primary difference the two stages is in consciousness the organism is able to interpret thoughts, feelings, emotion of itself and its surroundings. Whereas in unconsciousness the organism’s mental state has been altered due to little or no data coming in about self and surroundings.

Consciousness defies definition. It may involve thoughts, sensations, perceptions, moods, emotions, dreams, and an awareness of self, although not necessarily any particular one or combination of these. Consciousness is a point of view, an I, or what Thomas Nagel called the existence of “something that it is like” to be something. Julian Jaynes has emphasized that “Consciousness is not the same as cognition and should be sharply distinguished from it. … The most common error … is to confuse consciousness with perception.” He says, “Mind-space I regard as the primary feature of consciousness. It is the space which you preoptively are ‘introspecting on’ or ’seeing’ at this very moment”.

Ned Block divides consciousness into phenomenal consciousness (similar definition to subjective consciousness), which is subjective experience itself (being something), and access consciousness, which refers to the availability of information to processing systems in the brain (being conscious of something).

The issue of what consciousness is, and to what extent and in what sense it exists, is the subject of much research in philosophy of mind, psychology, neuroscience, cognitive science, and artificial intelligence. Issues of practical concern include how the presence of consciousness can be assessed in severely ill individuals to what extent non-humans are self conscious; at what point in fetal development consciousness begins; and whether computers can achieve conscious states.

In common parlance, consciousness denotes being awake and responsive to the environment, in contrast to being asleep or in a coma.Unconsciousness, more appropriately referred to as loss of consciousness or lack of consciousness, is a dramatic alteration of mental state that involves complete or near-complete lack of responsiveness to people and other environmental stimuli. Being in a comatose state or coma is an illustration of unconsciousness. Fainting due to a drop in blood pressure and a decrease of the oxygen supply to the brain is an illustration of a temporary loss of consciousness. Loss of consciousness must not be confused with altered states of consciousness, such as delirium (when the person is confused and only partially responsive to the environment), normal sleep, hypnosis, and other altered states in which the person responds to stimuli.

Loss of consciousness should not be confused with the notion of the psychoanalytic unconscious or cognitive processes (e.g., implicit cognition) that take place outside of awareness.Loss of consciousness may occur as the result of traumatic brain injury, brain hypoxia (e.g., due to a brain infarction or cardiac arrest), severe poisoning with drugs that depress the activity of the central nervous system (e.g., alcohol and other hypnotic or sedative drugs), severe fatigue, and other causes.