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Unformatted text preview: usly perceived M. Bassil PSYC 202 6 Create PDF files without this message by purchasing novaPDF printer ( 11/4/2009 Neural Basis of Consciousness How does brain activity produce consciousness? Consciousness Consciousness is a Global Workspace: Global No No single place in brain for consciousness largely separate but interacting info-processing processing modules working in parallel with some cross talk (perform (perform many tasks: sensation, perception, memory, planning, etc…) unified & integrated activity of multiple modules in unified different brain areas that is strong enough to produce a conscious perception or thought (just (just like a choir: unitary, yet competing for attention) M. Bassil PSYC 202 Circadian Rhythms Our Our Daily Biological Biological Clocks It is our 24 hour day-night cycles: night rhythmic change in body temperature, certain hormonal secretion, & other bodily functions that take place & influence influence our alertness or readiness to sleep 7 Create PDF files without this message by purchasing novaPDF printer ( 11/4/2009 Keeping Keeping Time ((Brain & Environment) Brain The brain’s master circadian clock is the Suprachiasmatic nuclei (SCN): found in the (SCN): hypothalamus; regulate most circadian rhythms (we (we have a genetically programmed cycle of activity & inactivity) Are Are linked to pineal gland that secretes melatonin melatonin (hormone with a relaxing effect on body) SCN SCN active in day, reducing pineal gland secretion in reducing & raising body temp & heightening alertness raising SCN SCN inactive at night (melatonin high ►relaxation & at (melatonin relaxation sleepiness) sleepiness) M. Bassil PSYC 202 Keeping Keeping Time ((Brain & Environment) Brain Although it Although has a 24h biological schedule, environmental cues affect the circadian rhythm: rhythm: Example: Daylight Daylight increases SCN activity to reset the biological clock (eyes have neural connections to SCN) SCN) Live Live underground or under experimental conditions with no light free-running running circadian circadian rhythm (longer than 24hrs) M. Bassil PSYC 202 8 Create PDF files without this message by purchasing novaPDF printer ( 11/4/2009 Keeping Keeping Time ((Brain & Environment) Brain CR also influence our being: Early Birds (morning person) or Night Owls (morning or (night person): Compared Compared to night people, morning people, sleep & rise earlier; their body temperature, blood pressure, & alertness alertness peak earlier in day Early Early birds are more likely to enroll & perform better in early early classes Cultural differences: Students in Columbia, India, & Spain (warmer climates) ► greater “morningness” than those in England, US, & greater Netherlands Netherlands M. Bassil PSYC 202 Environmental Disruptions of CR Jet lag: sudden disruption of CR due to flying across sudden time zones; adjust faster flying west (you stay awake, then compensate) compensate); take melatonin pills or control exposure to light Night-shift work: recipe for disaster; very hard to adjust recipe biological clock ► fatigue (sleep less), errors, stress & fatigue (sleep errors, more accident prone; days off alter adjustments again (try (try to maintain same sleep schedule) Seasonal affective disorder (SAD): cyclic tendency to (SAD): become psychologically depressed during certain s...
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