One is at ease in talking about the state of unconsciousness, coma and death, but it is
still an enigma to define consciousness. The best way we can define consciousness is ability to
interact with environment. Much recent effort has focused on the neurobiological
underpinnings of the conscious stage, beginning with experimental studies isolating the roles
of several core human brainstructures. In this paper we present the definition and features of
state of consciousness and its implications.
Key words: Consciousness, disorders of consciousness, unconsciousness
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