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Wakefulness is a daily recurring brain state and state of consciousness in which an individual is conscious and engages in coherent cognitive and behavioral responses to the external world. Being awake is the opposite of being asleep, in which most external inputs to the brain are excluded from neural processing. [1] [2] [3] [4]
Dehaene distinguishes conscious access from related but not identical ideas: "attention, wakefulness, vigilance, self-consciousness, and metacognition" (p. 25).. He introduces the project of measuring neural correlates of consciousness using paradigms like minimal contrasts of images, masking (subliminal stimuli), binocular rivalry, and attentional blink.
Consciousness Philosophers have used the term consciousness for four main topics: knowledge in general, intentionality, introspection (and the knowledge it specifically generates) and phenomenal experience... Something within one's mind is 'introspectively conscious' just in case one introspects it (or is poised to do so).
"Consciousness", as far as neurology can determine, is not something that can deduced from the behavior of an agent: it is always possible that the machine is simulating the experience of consciousness, without actually experiencing it, similar to the way a perfectly written fictional character might simulate a person with consciousness.
Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep. (Its corresponding state is hypnopompia –sleep to wakefulness.) Mental phenomena that may occur during this "threshold consciousness" include hallucinations, lucid dreaming, and sleep paralysis.
Cover of James Joyce's Ulysses (first edition, 1922), considered a prime example of stream of consciousness writing styles. Stream of consciousness is a literary method of representing the flow of a character's thoughts and sense impressions "usually in an unpunctuated or disjointed form of interior monologue."
Phenomenal Judgements: A theory of consciousness should be able to dispel epiphenominalism [note 7] [16] without resorting to interactionism (a view which Chalmers rejects). [ 17 ] The Double-Aspect Principle : Some information must be realised both physically and phenomenologically (i.e., realised both in the mind and brain).
There are two common but distinct dimensions of the term consciousness, [10] one involving arousal and states of consciousness and the other involving content of consciousness and conscious states. To be conscious of anything the brain must be in a relatively high state of arousal (sometimes called vigilance ), whether in wakefulness or REM ...