http://en.wikipedia.org/wiki/Consciousness
Vedanta
According to Vedanta, awareness is not a product of physical processes and can be considered under four aspects. The first is waking consciousness (jagaritasthana), the identification with “I” or “me” in relationship with phenomenal experiences with external objects. The second aspect is dream consciousness (svapna-sthana), which embodies the same subject/object duality as the waking state. The third aspect of consciousness is deep sleep (susupti), which is non-dual as a result of holding in abeyance all feelings, thoughts, and sensations. The final aspect is the consciousness that underlies and transcends the first three aspects (turiya) also referred to as a trans-cognitive state (anubhava) or a state of self-realization or freedom from body-mind identification (moksha). [ 66 ] The state of turiya has been correlated with physiological and bio chemical changes in the body. [ 67 ] Gaudiya Vedanta recognizes a fifth aspect of consciousness in which God becomes subordinate to bhakti. [ 68 ]
[edit] Vijñana
In Buddhism, consciousness ( viñña?a ) is included in the five classically defined experiential "aggregates". The aggregates are seen as empty of self-nature; that is, they arise dependent on causes and conditions. The cause for consciousness arising (viñña ? a) is the arising of another aggregate (physical or mental); and, consciousness arising in turn gives rise to one or more of the mental (nama) aggregates. The causation chain identified in the aggregate (khandha) model overlaps the conditioning chain in Dependent Origination (paticcasamuppada) model. [ 69 ] Consciousness is the third link, between mind body mental formations and name & form in the traditional Twelve Causes (nidana) of Dependent Origination. [ 70 ] The six classes of consciousness are: eye-consciousness, ear-consciousness, nose-consciousness, tongue-consciousness, body-consciousness, intellect-consciousness. [ 71 ] The following aspects are traditionally highlighted within Dependent Origination: