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Biological rhythms
Infradian and ultradian rhythms
Ultradian rhythms
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Created by
Billy Dudden
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Evaluation
A Level > Psychology > Biopsychology > Biological rhythms > Infradian and ultradian rhythms > Ultradian rhythms
2 cards
Cards (5)
What are ultradian rhythms?
Biological rhythms with a
frequency
of
more
than one in
24 hours
E.g. the
sleep cycle
The sleep cycle
5 stages -
90 minutes
each
Measured using
EEG
Stages 1 and 2 -
light
sleep,
easy
to wake, brain waves
high
frequency
low
amplitude,
alpha
waves,
sleep spindles
Stages 3 and 4 -
Deep
sleep/slow wave sleep,
delta
waves,
low
frequency
high
amplitude,
difficult
to wake
Stage 5 (
REM
) - body is
paralysed
, brain activity resembles
awake
,
theta
waves, eyes
move
occasionally,
dreams
most often
Sleep staircase
Stages
1
,
2
,
3
,
4
then
3,
2
,
REM
, then
2
,
3
,
4
,
3,
2,
REM
etc
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