PSYC 1000 Lecture Notes - Lecture 11: Sleep Deprivation, Sleep Hygiene, Involuntary Servitude
14 Dec 2016
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Sensation, perception and consciousness (part 3)
Introduction to Psychology PSYC*1000-01 Lecture 11
October 18th 2016
1. What is consciousness?
• I psholog, it ofte efes to a peso’s sujetie aaeess of iteal ad eteal stiuli, iludig thoughts,
perceptions, experiences, and self-awareness.
What are typical variations of consciousness?
• Autoati aiatios, suh as dadeaming, drowsiness, sleep and dreams
• Phsiologial aiatios, suh as halluiatios, lak of oge, ogass
• Pshologial aiatios, suh as seso depiatio, hposis, idfuless editatio
2. Sleep and dreams
Rhythms of sleep
• Pae of 0 minutes
• Appoiatel ee iutes e pass though fie stages of sleep
• These stages ae assoiated ith diffeet ai aes
• Va i feue & aplitude
• Bai aes ae easued ith a eletoeephaloga EEG
Awake and active
• Beta waves: high frequency, low amplitude
• These aes ae ofte iegula aes
Awake and calm
• Alpha aes: elatiel high feue & lo aplitude • But, less feuet ad oe aplitude tha eta aes • Moe
regular than beta waves
• Stages 1 and 2
• Waves of larger amplitude, slow, & regular, called Theta waves
• Also observed during daydreams
• “tages ad
• During deep sleep the brain
• activity slows
• Waves of high amplitude, very slow, & regular called Delta waves
Stage 5: Rapid eye movement
• After reaching stage 4 cycle returns to the starting point
• Brain activity increases, Beta waves emerge (small amplitude, fast and regular)
• Very similar to our waking state
• Heart rate and respiration increase
• Eye movements under eyelids
• Brainstem blocks signals from
• the motor areas (paralyzed)
• The stage where we dream
Variations within 90 minute cycles
• With eah stage of iutes tie spet i stage deeases ad the tie i spet i REM ieases
Why do we sleep?
Theories about the function(s) of sleep
• Potetio: “leep staig hidde ithout oeet a hae ee adaptie fo a eolutioa pespetie.
• Reoe: “leep helps estoe ad epai ai tissue.
• Cosolidatio: While sleepig e osolidate, build and
rebuild our memories.
• Goth: Duig sleep the pituita glad eleases goth hooes.
• “eios eleases less of this hooe ad sleep less.
What are the effects of sleep deprivation?
• Concentration decreases significantly
• Memory decreases significantly
• Loss of emotional control
• Ineffective immune system
• • Ieased suseptiilit to ifetious ad hoi diseases
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Document Summary
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