PSYC 1010 Lecture Notes - Lecture 7: Slow-Wave Sleep, Theta Wave, Delta Wave
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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
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
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