Tutorial 5 Flashcards
What happens when you are awake?
Alert
Normal making brain activity shows an irregular pattern with a high mental activity level
EEG - Beta waves
14 cycles/sec
What happens when you are relaxed, and your eyes are closed?
When you close your eyes and begin to relax, you transition into sleep
EEG- Alpha waves Emerge
12 cycles/sec
What is shown on the EEG when you’re alert?
Beta waves
At what rate are Beta EEG waves?
14 cycles per second, when you are alert
What is shown on the EEG when you are relaxed and your eyes are closed?
Alpha waves Emerge
At what are emerging Alpha waves?
12 cycles per second, when relaxed and closed eyes
What is classified as NREM sleep?
Stage 1
Stage 2
Stage 3 - Stage 4
What happens when you’re in Stage 1 of NREM sleep?
This stage lasts only a few minutes (5-10 min) Your drift from drowsiness into sleep - 4x main things occur a. Eye movements slow b. Blood pressure drops c. Muscles relax d. Calm state EGG- Slower Theta waves appear
What is shown on the EEG when you’re in Stage 1 of NREM sleep?
Slower Theta waves appear
What happens when you’re in Stage 2 of sleep?
Sleep deepens
EEG- Slightly larger waves
interrupted by burst of low amplitude activity (sleep spindles)
and slow high amplitude waves called (K complexes)
-Alpha waves disappear
What is shown on the EEG when you’re in Stage 2 of NREM sleep?
Alpha waves disappear
Slightly larger waves
which are interrupted by bursts of low amplitude activity (sleep spindles)
+ slow, high amplitude waves (K complexes)
What are sleep spindles?
Bursts of Low amplitude activity (oscillation)
interrupts larger waves of Stage 2 sleep
What are K complexes?
slow, high amplitude waves (big spikes)
interrupts larger waves of Stage 2 sleep
What happens when you’re in Stage 3 of NREM sleep?
Large, slow delta waves (less than 50% of recorded brain activity is Delta waves)
essentially just the transition period from Stage 2 - 4
What is shown on the EEG when you’re in stage 3 of NREM sleep?
Delta waves
Less than
What are other names for Stage 3 - 4 NREM sleep?
Delta sleep
Slow wave sleep
What does Sleep walking and talking occur?
Stage 4
What happens when you’re in Stage 4 of NREM sleep?
When delta waves make up 50% of recorded brain activity, you have entered Stage 4 sleep Delta sleep, characterised by: a. relaxed muscles b. lowering of body temperature c. Muscles rest and rejuvenate >50% Delta Waves
What signifies the transition from Stage 3 to Stage 4 NREM sleep?
When Delta waves make up 50% of the recorded brain activity
What is shown on the EEG when you’re in stage 4 of NREM sleep?
> 50% Delta waves
When do you begin to see delta waves?
Stage 3
How long does stage 1 of NREM sleep last?
5-10 minutes
Stage 1 only last for a few minutes
How long does stage 2 of NREM sleep last?
20 minutes