Infradian rythms

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Reinberg
Menstrual cycles- report of woman- 3 months in cave- no natural light- shortened menstrual cycle to 25.7 days. Shows IR's are influenced by EZ's e.g light cues
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Russel et al
Applied to women underarm sweat- menstrual cycles became synchronised to donor- supports McClintock suggested pheromones acted EZ's and can influence EP's
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McClintock
Supported by Russell
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Turke
Child caring- evolutionary significance- synchronised periods allowing women to share child caring duties
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Eastman
Placebo- also at work- pps simply believe that a therapy will work. One study found the 32% pps reported improvement with placebo alone. suggests effectiveness is questionnable
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Rosenzweig
SAD- may bring low moods in some individuals due to darkness. Darkness stimulates production of Melatonin which causes sleep. Stresses importance of light as an EZ
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Russel et al

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Applied to women underarm sweat- menstrual cycles became synchronised to donor- supports McClintock suggested pheromones acted EZ's and can influence EP's

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McClintock

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Turke

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Eastman

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