Infradian And Ultraduan Rhythms

Question 1

Infradian

Answer 1

MORE THAN 24H

eg

Menstrual Cycle
SADS

Question 2

Menstrual cycle

Answer 2

Lasts 28 days

Progesterone levels ++

Lining thicker

Question 3

SADS

Answer 3

Low mood

Lack of activity

‘winter blues’

Due to lack of light x excess melatonin?

Question 4

McClintok

Answer 4

Period X pheromones

Diff cycles cotton pad armpit

68% changes in cycle to be closer to ‘odor donor’

Question 5

AO3: ❌✅ Advantageous…

Answer 5

Share pregnancy

Collective caring for offspring

+++ Survival

❌ Schank- competition for best male for genes

Survival of fittest- disadvantage

Question 6

AO3: ✅ Practical Application

Answer 6

SADS treatment

Lightbox therapy

Hells 80% sufferers

Improves Q of L

Economy?

Question 7

AO3: ❌ MC Clintok Confounding

Answer 7

Other variables

Stress X diet

FX results

Reduces internal validity x credibility

Question 8

Ultradian

Answer 8

Less than 24h

E.g. sleep cycle

Question 9

Sleep cycles

Answer 9

5 stages each 90 mins

1 x 2
Light sleep
Alpha
Theta waves

3x4
Deeper sleep
Delta waves

5
REM
body paralysis
Dreaming

Question 10

AO3: ✅ BRAC

Answer 10

Supporting evidence

90 mins of focus

Alert v fatigue across day

Ericsson 1993
Violinist best in 90m then break

IRL application

Question 11

AO3: ✅ Stages

Answer 11

Dement Kleitman

Sleep lab x REM patterns

Activity varied on vividity of dreams

Woke while dreamt- ++ recall

Evidence increases validity

Question 12

AO3: ❌ Indiv Diffs

Answer 12

Diff sleep stages

Tucker

Tests time, duration X amount slept

Found large individual diffs

Less generalisable