Infradian rhythms

infradian rhythms are biological cycles lasting more than 24 hours e.g. menstrual cycle. 

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Russel et al
applied underarm sweat of donor women to the upper lips of femael participants finding that menstrual cycles became synchronized suggesting that pheromones act as exogenous zeitgebers
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Reinberg
reported on a woman who spent 3 months in a cove without natural lighting. Her menstrual cycle shortened to 25.7 days. implying that infradian rhythms are influenced by exogenous zeitgebers like light.
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Rosenzweig et al
reported on (SAD) whereby winter darkness brings about low moods It has been associated with darkness stimulating the production of melantonin, a hormone linked with the regulation of sleep showing the importance of light as an exogenous zeitgebers
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Turke
Believes that there is an evolutionary significance in women being able to have synchronized periods, he claimed that it allowed women living together to synchronize pregnancies and share child-caring duties
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Mcclintock and stern
the experimental groups’ menstrual cycles were affected by the secretions from the control group. This explains why when a group of women live in close proximity their menstrual cycles tend to synchronize.
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Card 2

Front

reported on a woman who spent 3 months in a cove without natural lighting. Her menstrual cycle shortened to 25.7 days. implying that infradian rhythms are influenced by exogenous zeitgebers like light.

Back

Reinberg

Card 3

Front

reported on (SAD) whereby winter darkness brings about low moods It has been associated with darkness stimulating the production of melantonin, a hormone linked with the regulation of sleep showing the importance of light as an exogenous zeitgebers

Back

Preview of the back of card 3

Card 4

Front

Believes that there is an evolutionary significance in women being able to have synchronized periods, he claimed that it allowed women living together to synchronize pregnancies and share child-caring duties

Back

Preview of the back of card 4

Card 5

Front

the experimental groups’ menstrual cycles were affected by the secretions from the control group. This explains why when a group of women live in close proximity their menstrual cycles tend to synchronize.

Back

Preview of the back of card 5

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