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Page 1

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PSYA3
BIOLOGICAL RHYTHMS
A2 PSYCHOLOGY
AQA

Page 2

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Circadian Rhythms
Dip after lunch regardless
of whether you eat
1. THE MAIN Circadian rhythm is the sleep-wake cycle = lasts 24 hours. Endogenous
pacemakers (internal clocks) and exogenous zeitgebers (external time givers) are
both involved.
For example light, as an exogenous zeitgeber tells us when to go to bed…

Page 3

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Melatonin + growth
hormones = both
peak at
4am = body temp is at

midnight
its lowest
body temp begins
to drop during the
prepare for sleep
evening as we

Page 4

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A02
Folkard et al -
read stories to children aged 12-13 years old at either 9am or 3pm = the
afternoon group (highest core body temp) retained more information - 8% more than the
morning group
THEREFORE ... long-term recall is best when body temp is at its highest

Gupta…

Page 5

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target hormone levels are low, but are fully effective if taken when levels are high
Siffre = case study, NOT GENERALISABLE + living in a cave may have certain effects due to
the fact its cold

Page 6

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At stage 2 the waves start to slow down even further as you fall asleep = greater wave
amplitude at points = K complexes Bursts of increased wave frequency = spindles heart rate
continues to slow and temperature continues to drop

-
LOW AMPLITUDE -
HIGH FREQUENCY
-
GREATER AMPLITUDE…

Page 7

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FAST, DESYNCHRONISED EEG ACTIVITY RESEMBLING THE
AWAKE BRAIN

Page 8

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REM sleep is also known as the paradoxical sleep as the brain and eyes are active but the body
is paralysed
An issue with REM sleep is the assumption that it its dreaming sleep...


Dement and Kleitman =
support of stages of sleep and dreaming in REM
Woke participants up…

Page 9

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Page 10

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A02

Infradian rhythm-
Infradian rhythms last longer than 24 hours
Monthly cycle The human female menstrual cycle is the most well
known infradian rhythm = regulates ovulation. The menstrual cycle = involves fluctuating
hormone levels of progesterone and oestrogen. Progesterone causes an increase in the blood
in the lining of…

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Pages in this set

Page 1

Preview of page 1
PSYA3
BIOLOGICAL RHYTHMS
A2 PSYCHOLOGY
AQA

Page 2

Preview of page 2
Circadian Rhythms
Dip after lunch regardless
of whether you eat
1. THE MAIN Circadian rhythm is the sleep-wake cycle = lasts 24 hours. Endogenous
pacemakers (internal clocks) and exogenous zeitgebers (external time givers) are
both involved.
For example light, as an exogenous zeitgeber tells us when to go to bed…

Page 3

Preview of page 3
Melatonin + growth
hormones = both
peak at
4am = body temp is at

midnight
its lowest
body temp begins
to drop during the
prepare for sleep
evening as we

Page 4

Preview of page 4
A02
Folkard et al -
read stories to children aged 12-13 years old at either 9am or 3pm = the
afternoon group (highest core body temp) retained more information - 8% more than the
morning group
THEREFORE ... long-term recall is best when body temp is at its highest

Gupta…

Page 5

Preview of page 5
target hormone levels are low, but are fully effective if taken when levels are high
Siffre = case study, NOT GENERALISABLE + living in a cave may have certain effects due to
the fact its cold

Page 6

Preview of page 6
At stage 2 the waves start to slow down even further as you fall asleep = greater wave
amplitude at points = K complexes Bursts of increased wave frequency = spindles heart rate
continues to slow and temperature continues to drop

-
LOW AMPLITUDE -
HIGH FREQUENCY
-
GREATER AMPLITUDE…

Page 7

Preview of page 7
FAST, DESYNCHRONISED EEG ACTIVITY RESEMBLING THE
AWAKE BRAIN

Page 8

Preview of page 8
REM sleep is also known as the paradoxical sleep as the brain and eyes are active but the body
is paralysed
An issue with REM sleep is the assumption that it its dreaming sleep...


Dement and Kleitman =
support of stages of sleep and dreaming in REM
Woke participants up…

Page 9

Preview of page 9

Page 10

Preview of page 10
A02

Infradian rhythm-
Infradian rhythms last longer than 24 hours
Monthly cycle The human female menstrual cycle is the most well
known infradian rhythm = regulates ovulation. The menstrual cycle = involves fluctuating
hormone levels of progesterone and oestrogen. Progesterone causes an increase in the blood
in the lining of…

Comments

No comments have yet been made