sleep

Question 1

4 behavioural criteria of sleep

Answer 1

stereotypic or species-specific posture (atonia), minimal movement, reduced responsiveness to external stimuli, reversible after stimulation

Question 2

what 3 situations are not reversible after stimulation

Answer 2

coma, anaesthesia, death

Question 3

physiological criteria of sleep: electroencephalogram (EEG)

Answer 3

measures brainwaves

Question 4

physiological criteria of sleep: electrooculogram (EOG)

Answer 4

measures eye movements

Question 5

physiological criteria of sleep: electromyogramm (EMG)

Answer 5

measures muscle activity

Question 6

5 stages of sleep

Answer 6

stages 1 and 2 (NREM) -> stages 3 and 4 (NREM) -> stage 5 (REM)

Question 7

EEG, EOG and EMG when awake

Answer 7

EEG very active (fast rhythms), EOG varied, EMG expected activity

Question 8

EEG, EOG and EMG in stages 1 and 2 (NREM)

Answer 8

EEG slower rhythm, EOG flat, EMG less active

Question 9

EEG, EOG and EMG in stages 3 and 4 (NREM)

Answer 9

EEG slowest rhythm (largest amplitudes), EOG slightly more active

Question 10

EEG, EOG and EMG in stage 5 (REM)

Answer 10

EOG has huge eye movements, EEG similar rhythm to awake, EMG flat

Question 11

how long is a single sleep cycle

Answer 11

approx. 90 minutes

Question 12

how long does each stage of sleep last

Answer 12

stage 1: 12 minutes, stage 2: 12 minutes, stage 3: 12 minutes, stage 4: 12-15 minutes, stage 5: 10 minutes; mutliple sleep cycles

Question 13

EEG in 5 stages

Answer 13

slows down (sleep spindles in stage II), but becomes similar to awake in stage 5 REM sleep

Question 14

when do heart rate and respiration increase during sleep cycles

Answer 14

in REM (stage 5)