Summary Problem 6 Sleep

Sleep  Active process
 Decreased responses
 Is a behavior
Stages
-1 sleep EEG  Low voltage
 High frequency (slower than awake)
- Initial stage 1 First after falling asleep
 No changes in EOG and EOG
- Emerge stage 1 Later stage 1 sleep
 Accompanied by REMs
o REM Rapid eye movement
 Period in which we dream
 Low voltage
 Fast EEG
 Reduction of core-muscle tone
 EEG desynchronization
 Nonexplicit learning
 More REM sleep if it is deprived (rebound)
o Default theory: difficult to stay in
NonREM sleep so it switches to REM
 Activation Why we dream
synthesis theory  During REM cerebellum bombards cortex with
random signal
 Cortex want to make sense out of them
(Dream)
-2 sleep EEG Higher amplitude and lower frequencies
- K complexes Single large negative wave followed by single positive
wave (negative up/ positive down)
- Sleep spindle Short burst of 12- to 14-Hz waves
-3 sleep EEG Slow wave sleep
- Delta waves Largest and slowest EEG waves

 Each cycle is about 90 minutes
 If night goes further more time in stage 1 and
less in other

Measurement of
stages
-EEG Electroencephalogram (see task 4)
-EOG Electrooculugram
 Measurement of eye movement
-EMG Electromyogram
 Measure muscle toning in the neck

Function of sleep
- Recuperation Being awake disturbs homeostasis
theory  Sleep is required to restore it
 Long periods of wakefulness produces