Chapter 8 - Higher Functions and Perception Flashcards
What can be distinguished by the brains small electric field?
Whether or not it is:
Alert
At rest/asleep
The phase of sleep
What are the 5 stages of sleep?
1 - drowsiness - lasting 10 minutes
2 - light sleep with short periods of fast EEG waves - 20minutes
3 - deeper sleep
4 - deep, slow wave sleep - difficult to be aroused
5 - REM sleep - associated with dreaming
How long is a sleep cycle?
90 mins
How many sleep cycles are there in a night of sleep?
4 - 5
What happens to REM sleep as the night progresses?
It gets longer.
What is so special about REM sleep?
It rejuvinates your brain.
What happens if someone becomes sleep deprived?
Mood swings - irritability
Increased fatigue
Reduced concentration
Lack of attention
Increased risk of sensory illusions
Individual becomes prone to errors
Progressive decline in intellectual performance
What can prolonged sleep deprivation lead to?
increased severity of symptoms
How many sleep points does 1 hour of sleep give you?
2 points
How many sleep points does 1 hour of being awake take from you?
1 point.
What is the maximum amount of sleep point you can get in one nights sleep?
16
Why must you try to get more sleep if you go into sleep debt?
Sleep debt is cumulative so the only way to make up for it is to sleep for at least 8 hours in numerous sittings.
What happened to the performance reduction with increased altitude?
it gets even worse with altitude
What is the circadian rhythm?
Fluctuations of:
Body temperature; Blood pressure; Heart Rate; Sensory acuity; Adrenal gland output; Brain nuero-transmission level.
Usuallly locked to 24 hours but without visual cues - Zeitgebers - locks to 25 hours
What is circadian disrhythmia?
Where your circadian rhythm is incorrect for the time zone you are in, usually due to jet lag.
