L11 - Ultradian and Infradian Rhythms

Question 1

Examples of ultradian rhythms

Answer 1

Five sleep stages

Basic Rest Activity Cycle

Question 2

5 sleep stages consist of

Answer 2

NREM (1-4)

R.E.M. (5)

Question 3

EEGs show what about sleep?

Answer 3

Brainwaves, breathing and heart rates slow

5th stage EEG similar to awake person

Question 4

What happens during deep sleep?

Answer 4

Heart/breathing rate decrease

Brain waves slow down

Question 5

EEG during REM resembles what?

Answer 5

EEG resembles that of an awake person

Question 6

Describe the BRAC

Answer 6

90 min BRAC cycle occurs during sleep and wakefulness

Question 7

How do we progress through the BRAC?

Answer 7

Move from state of alertness to physiological fatigue

Question 8

What happens during end of BRAC?

Answer 8

Run out of resources
Lose concentration
Increased fatigue and hunger

Question 9

Example of infradian cycle?

Answer 9

Menstrual cycle

Question 10

Length of menstrual cycle?

Answer 10

23-36 days

Question 11

When does oestrogen rise?

Answer 11

Reaches peak halfway through cycle, so ovulation occurs

Question 12

What happens after ovulation?

Answer 12

Progesterone levels rise

Question 13

+ related to violinists

Answer 13

Studied elite violinist group and found they limited practised for 90 mins at a time
Napped to recover
Better violinists napped more frequently
Less fatigued, more resources improves performance

Question 14

+ related to female preferences

Answer 14

Usually prefer feminised faces for LT relationship
Preferred masculine during ovulation
Affects behaviour so is important

Question 15

• related to pheromones

Answer 15

Sweat from one group of women was rubbed onto upper lip of another group
Menstrual cycle became synchronised
Not just infradian rhythms