"there is now accumulating evidence that casts serious doubt on the existence of the phenomenon. First, the original 1971 study was criticised on methodological grounds. Second, a number of studies with both human groups and non-human species failed to replicate the initial findings, with at least as many studies reporting positive results as studies reporting negative ones.
Mathematical analyses have also revealed that some degree of synchrony is to be expected given the shifts in female reproductive condition over time, and that no adaptive process needs to be invoked to explain what is observed. In other words, synchrony or the overlap of cycles between females is best explained by chance."
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