Infradian and ultradian

Question 1

What is an infradian rhythm/how long does it last?

Answer 1

bio rhytms that lasts LONGER than a day 24hours.

E.g. Menstrual cycle.

Question 2

who did research on infradian rhythms?

Answer 2

McClintock and Stern investigated whether the menstrual cycle is influenced by the pheremone secretions from other women

Question 3

what was Mcclintock and sterns procedure?

Answer 3

Women wore ALCOHOL soaked pad in ARMPITS. Pheremones rubbed on the TOP LIP of another group of women and menstrual acycles were MONITORED.

Question 4

What were the findings?

Answer 4

69% showed CHANGES in their own cycle timings brought CLOSER to the cycle of ppts who they RECIEVED hormones from which SUPPORTS role of Exogenous Zeitgebers in human infradian rhythms.

Question 5

What are ultradian rhythms?

Answer 5

bio rhythms that are SHORTER than a day (24 hours)

E.g. 90 minute sleep cycle.

Question 6

Describe the 90 minute sleep cycle

Answer 6

sleep PROGRESSES to deeper and deeper sleep.

Begins at stages 1-5, 5 being REM sleep. These stages ar in cycles of 90 MINS. Then this is REVERSED after stage 4, REM is experienced instead. We experience dreams in REM.

Question 7

who studied ultradian rhythms?

Answer 7

Dement and Kleitman monitored ELECTRICAL activity in the brain of 9 ppts

Question 8

what was the procedure of ultradian rhythms study?

Answer 8

monitored ELECTRICAL activity of 9 ppts during sleep using EEG recordings. Woke ppts during DIFF stages of sleep. Ppl woke during REM sleep reported dreaming 90% of the time, only 77% woke outside of REM lead to dream recall.

This SUPPORTS the stages of sleep, in particular the role of REM sleep for dreaming.