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Lecture 7

Lecture 7 - Sleep This lecture is all about sleep. It may be continued next week... I can't remember if she finished all of the lecture today

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PSYC 1010
Rebecca Jubis

Lecture 7 Wed. Nov. 24/10 Variation in Consciousness – Chapter 5  EEG – Electroencephalograph – machine that measures brain waves  Characteristics of a brainwave are: o Amplitude – is measure in volt. Refers to the energy, the height of the wavelength. o Frequency -  Different wavelengths of sleep o Awake – Low-voltage, high frequency beta waves o Drowsy – Alpha waves prominent o Stage 1 sleep. Theta waves prominent o Stage 2. Sleep spindles and mixed EEG activity o Stage 3 and 4. Slow-wave sleep (stage 3 and stage 4 sleep. Progressively more delta waves. o Stage 5. REM sleep. Low-voltage, high- frequency waves  It’s a gradual transition from one stage to another. It is not possible to say at which time one stage ends and the other one begins.  Stage 1 – Hypnic Jerks o Hypnogogic State happens during stage one. The passing of being awake to going to sleep. “The transition stage”. o This stage includes theta waves o This stage is the lightest stage of sleep  Stage 2 – Sleep spindles o Relatively light sleep  Stage 3 and 4 – Slow wave sleep (SWS) o Usually takes about a good 30 minutes to get into slow wave sleep o Slow wave sleep is a heavy stage of sleep o Deep sleep  Stage 5 – REM sleep o REM stands for Rapid Eye Movement o This is the stage where we actually dream o EEGs resemble those of an awake person o Motor activity is eliminated (Physical movement) o It is difficult to awake the person o You have an irregular heart rate o Also known as paradoxical sleep – because your brain is wide awake o REM dreams tend to be more life like, more bizarre  Non REM sleep (NREM)  Dreaming can occur in other stages of sleep but they are not like REM sleep dreams. Chart Below  The cycles that we go through throughout the course of the night  What usually happens is you enter stage 1 sleep, and there is an orderly descent through the stages.  Usually it takes about 30 – 45 minutes to get into deep sleep  You stay there for about another 30 minutes and there is a rapid descent into stage 1 and stay there for another half hour then descend  The deepest stage of sleep disappears and it happens early on in the night.  You have four or so periods of REM sleep and each period gets longer and longer throughout the night.  REM sleep happens more at the end of night Awake Nightmares 1 2 3 Stage of Sleep 4 Sl
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