Consciousness Two concepts of consciousness: 1. Consciousness as general state of arousal (sleep vs. waking state) 2. Consciousness as focus of attention/awareness (controlled vs. automatic processing) Cognitive research on consciousness of focus of attn/aware (2nd concept). Unconscious priming: does occur, but with limitations (conscious processing necessary to disambiguate terms) Stem completion: again uncon influences, but within limits – con processing necessary for inhibition of primed completion (need to check 102 notes on these) Cognitive Studies of consciousness: Priming test • • • • • • Word or non-word RT measure FORK = word; DXMZ = non-word SIGN – FORK DXMZ – FORK SPOON – FORK (sig reduction in rt) Unconscious priming? -- yes Cognitive studies of consciousness: Exclusion task in priming • Coconut…palm (tree or wrist?) cons: only tree/uncon: either • Hand…palm (tree or wrist?) cons: only wrist/uncon: either • Stem completion task: complete BUT_ _ _ (could be butter or butler). What happens when one is presented earlier either consciously or unconsciously?) But can only be excluded consciously Consciousness • Research on Consciousness as general state of awareness (2nd concept) • Sleep vs. Waking state • Stages of sleep based on brain wave patterns (REM vs. NonREM) • Stem completion studies and anecdotal evidence indicates some limited awareness • Altered states: meditative and mystical/religious states – increased pain tolerance; loss of sense of self; union with ‘absolute’ Sleep and Dreams: Stages of Sleep • NREM (Non-Rapid-Eye-Movement) Sleep: • Stage 1 (lightest sleep) • Stage 2 (deeper sleep) • Stages 3 and 4 (deepest sleep) • REM (Rapid-Eye-Movement) Sleep: • Light sleep (also called paradoxical sleep) Sleep and Dreams: Stages of Sleep in a Typical Night Consciousness: Evolutionary Issues • Mirror test suggests some great apes have selfawareness, but monkeys do not • To what extent do apes other than humans know what other’s know? Consciousness: Philosophical Issues • Dualism: Mind and brain are separate substances; consciousness independent of physical matter/laws. Conforms with subjective experience, but violates laws of physics • Materialism: Mind is what brain does; rejects mind as causally relevant; conforms with laws of physics, but rejects subjective experience of agency • Emergence: Mind is emergence property of brain; depends on brain, but has own causal power. Baar’s Global Workspace Theory of Consciousness • 3 important elements • 1. Unconscious experts: brain structures that carryout various mental task – perceptual pattern recognition; language processing; face recognition; implicit memory processes, etc. • 2. Global workspace: brain structure allows for wide dissemination of a particular expert’s activity (may be thalamic-cortical network) • 3. Contextual biasing structures: activated schemas; intentions; task-relevant programs, etc that bias the competition for access to global workspace. Baar’s Global Workspace