Dormitory Effect
The menstrual synchrony theory asserts that the menstrual cycles of women who live together (such as in homes, prisons, convents, bordellos, dormitories, or barracks) can become synchronized over time. The existence of menstrual synchrony has not been definitively established, and studies investigating it have been controversial.
Research on human menstrual synchrony, also call the McClintock Effect, or the Wellesley Effect is related to the larger question of whether or not humans have or perceive pheromones and utilize chemosignaling.
Read more about Dormitory Effect: Adaptive Value/function, Criticism
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“The attention of those who frequent the camp-meetings at Eastham is said to be divided between the preaching of the Methodists and the preaching of the billows on the back side of the Cape, for they all stream over here in the course of their stay. I trust that in this case the loudest voice carries it. With what effect may we suppose the ocean to say, “My hearers!” to the multitude on the bank. On that side some John N. Maffit; on this, the Reverend Poluphloisboios Thalassa.”
—Henry David Thoreau (1817–1862)