Sleep

Question 1

What are the functions of sleep?

Answer 1

Energy conservation
Bodily repair
Memory consolidation

Question 2

What is the neural mechanism for sleep?

Answer 2

Deactivate reticular activating system
Inhibit thalamus
Inhibit RAS + cortex loop
Decreased cortical activity

Question 3

What does an EEG show when awake?

Answer 3

β waves - fast + irregular

50 Hz

Question 4

What does an EEG show when the eyes are closed?

Answer 4

α waves

10 Hz

Question 5

What does an EEG show in stage 1 of sleep?

Answer 5

Background α waves
Interspersed Ɵ waves
5 Hz

Question 6

What does an EEG show in stage 2/3 of sleep?

Answer 6

Background Ɵ waves
Sleep spindles = bursts of thalamic activity
K complexes

Question 7

What does an EEG show in stage 4 of sleep?

Answer 7

δ waves

1 Hz

Question 8

What does an EEG show in REM sleep?

Answer 8

Looks like awake EEG

Question 9

How does REM sleep occur?

Answer 9

Initiated in pons
Strong inhibition of thalamus
Descending inhibition of LMNs from RAS