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Lecture 5

PSYCH 111 Lecture Notes - Lecture 5: Delta Wave, Sleep Spindle, Jet LagPremium

4 pages38 viewsWinter 2019

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Shelly Schreier

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Lecture 5:
Consciousness – awareness of internal/external stimuli
Various kinds of awareness:
o External events
o Internal sensations
o Of oneself as unique to experiences
o Of thoughts about experiences
Conscious content includes:
o Current concerns, daydreams, unwanted thoughts
Properties of consciousness:
o Intentionality – being directed toward an object (purposeful action you
o Unity – resistance to division (brain organizes things together)
o Selectivity – cocktail party phenomenon
o Transience – tendency to change
Sublimian perception – can we be unaware of things and they still have an
o James Vicary and “Drink Coke and Eat Popcorn”
o Kronsnick study – subliminal messages shape attitudes without conscious
o Freud’s Three Levels of Consciousness:
§ Conscious – mental events we are aware of
§ Preconscious – mental events can be brought to our awareness
§ Unconscious – mental events inaccessible to awareness
Circadian Cycles – internal clocks different to each individual
o Most run on 24 hour cycle
o Almost all set for sleep at night
o Night time sleepiness – 2am-6am peak
o Siesta zone – 1-4pm
o Programmed for naps
o Jet lag – traveling from west to east more challenging
Sleeping and dreaming
o Functions of sleep:
§ Memory consolidation
§ Energy conservation
§ Helps restore bodily functions
o Sleep deprivation:
§ Decrease immune functions
§ Leads to hallucinations/perceptual disorders
§ Less alert/attentive
§ More irritable
§ Ability to perform simple tasks declines
Stages of Sleep – REM vs Non REM
Non REM (Rapid Eye Movement) Sleep:
o Stage 1: light sleep, small irregular brain waves, muscles relax
o Stage 2: high peaking waves, sleep spindles, burst of electrical activity
o Stage 3: deep sleep, delta waves, slow with high peaks
o Stage 4: progressively more delta waves (deep sleep)
o Cycle: 1, 2, 3, 4, 3, 2, then REM
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