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Ch.9
Sleep
Question | Answer |
---|---|
Electroencenphalogram (EEG) | electrodes to scalp to monitor brains activity |
Electromygram (EMG) | electrodes to face to monitor muscle activity |
Electro-oculogram (EOG) | electrodes attached around eyes monitor eye movements |
wakefulness | Alpha and Beta activity |
sleep | Beta, Theta and Delta activity |
Stage 1/Theta | Theta brainwave activity Transition period between sleep and wakefulness Hypnic jerks (muscle contractions followed by relaxation) Falling sensation |
Stage 2/sleep spindles and K complexes | Ten minutes after stage 1 EEG is generally irregular during Stage 2 Contains Sleep Spindles and K Complexes Sleeping soundly, but might not believe so if wakened |
K Complexes | are isolated periods of neural inhibition |
Sleep spindles | are used for the consolidation of memory and are correlated with intelligence. |
Stage 3/slow wave, Delta | 15 minutes after stage 2 Characterized by high-amplitude Delta activity Also referred to as “slow wave” sleep Deepest stage of sleep |
REM Sleep/Theta and Beta | 90 minutes after we begin sleeping Desynchronized EEG Rapid eye movements Loss of muscle tone (paralysis) When wakened, people are alert and attentive Brain is very active during this stage Male penis and female clitoris active during this stage |
sleep stages | Sleep Cycles are typically 90 minutes each Alternate between stages and spend about 20-30 minutes in REM |
Slow-Wave Sleep | EEG synchrony (slow waves) moderate muscle tonus slow or absent eye movements lack of genital activity |