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Infradian and ultradian rhythms
Infradian rhythms
Evaluation
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Created by
Billy Dudden
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Cards (2)
Implication - role of exogenous zeitgebers
Stern
and
McClintock
-
29
women with
irregular periods
Samples of
pheromones
gathered from
9
of the women at different stages via cotton pad on armpit for
8 hours
Pads frozen and rubbed on
top lip
of
20
women
68%
of women experienced changes in cycles closer to
donor's
Therefore, infradian rhythms also use
exogenous zeitgebers
Methodological issues
Many
confounding variables
in
synchronisation studies
Any supposed pattern of
synchronisation
is no more than would have been expected to occur by
chance
Explains why other studies (
Trevathan et al.
) failed to
replicate
findings
Therefore, studies are
flawed
, decreasing
internal validity