The idea that periods can synchronize was first investigated in a , who examined the menstrual cycles of women living together in dorms. McClintock found that after 7 months of living together, women鈥檚 periods had gone from an average of 6.5 days apart to 4.6 days apart, leading to the idea that proximity caused the periods of these women to synchronize due to some chemical signal.
However, since 聽have been largely unable to replicate these findings. McClintock's聽results are now largely believed to have occurred by chance or poor experimental design, with many researchers calling menstrual synchrony a .
While it may appear that periods are synchronizing, it is important to that not everyone has a 28-day cycle, as some range from 21-35 days. This variability allows synchronicity to vary聽and periods to occur at the same, or different times.聽
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