Lesson 12 - Infradian Rhythms

Question 1

What are infradian rhythms

Answer 1

Cycle that lasts MORE than 24 hours

Question 2

What are examples of infradian rhythms

Answer 2

The menstrual cycle

Question 3

How often does the menstrual cycle repeat itself

Answer 3

• 28 days

• Can be 23-36

Question 4

What regulates the menstrual cycle

Answer 4

Hormones

Question 5

What is ovulation

Answer 5

• Halfway through cycle

• Oestrogen levels peak for 16-32 hours

Question 6

What happens after ovulation

Answer 6

• Progesterone levels increase

• Prep for possible embryo in uterus

Question 7

+ Infradian rhythms can affect behaviour

Penton-Voak(1999)

Answer 7

• Women prefer feminised male faces when choosing partner for long-term relationship

• Preference for masculinised face during ovulation

Question 8

(-) Menstrual cycle not just governed by infradian rhythms

Answer 8

• Menstrual cycles can synchronise

• Samples of sweat were collected from one group

-rubbed onto top lip of another group

• Cycles became synced

• Suggest pheromones are responsible