Sleep

Question 1

What would you expect to find on an EEG, EOG and EMG in the awake stage?

Answer 1

EEG: Fast activity, high frequency, beta activity
EOG: Some eye movements
EMG: Strong muscle tone

Question 2

What would you expect to find on an EEG, EOG and EMG in the stages 1&2 of sleep?

Answer 2

Slow wave/NREM sleep
EEG: brain activity slows, theta activity, drowsiness
EOG: No eye movements
EMG: Muscle tone reduces

Question 3

What would you expect to find on an EEG, EOG and EMG instates 3&4 of sleep?

Answer 3

EEG: brain activity is even slower, delta activity, low frequency
EOG: no real eye movement
EMG: low muscle tone

Question 4

What would you expect to find on an EEG, EOG and EMG in stage 5 of sleep?

Answer 4

REM sleep
EEG: fast brain activity, similar to beta activity
EOG: wide eye movements
EMG: minimal muscle tone

Question 5

How long is one typical sleep cycle?

Answer 5

1-1.5 hours

Question 6

What are the bodily functions that are synchronised to NREM and REM sleep?

Answer 6

NREM: slow HR and respiration decreases
REM: HR and respiration rate increases

Question 7

How does the reticular activating system influence arousal?

Answer 7

It is the main control on consciousness which is generally synced with the level of arousal.
It can directly or indirectly through the intralaminar nuclei of the thalamus project to the cortex.