Sleep Flashcards
(9 cards)
What are the functions of sleep?
Energy conservation
Bodily repair
Memory consolidation
What is the neural mechanism for sleep?
Deactivate reticular activating system
Inhibit thalamus
Inhibit RAS + cortex loop
Decreased cortical activity
What does an EEG show when awake?
β waves - fast + irregular
50 Hz
What does an EEG show when the eyes are closed?
α waves
10 Hz
What does an EEG show in stage 1 of sleep?
Background α waves
Interspersed Ɵ waves
5 Hz
What does an EEG show in stage 2/3 of sleep?
Background Ɵ waves
Sleep spindles = bursts of thalamic activity
K complexes
What does an EEG show in stage 4 of sleep?
δ waves
1 Hz
What does an EEG show in REM sleep?
Looks like awake EEG
How does REM sleep occur?
Initiated in pons
Strong inhibition of thalamus
Descending inhibition of LMNs from RAS
