Nature229, 244 - 245
(22 January 1971); doi:10.1038/229244a0
Menstrual Synchrony and Suppression
MARTHA K. MCCLINTOCK
Department of Psychology, Harvard University, Cambridge, Massachusetts 02138
Synchrony and suppression among a group of women living together in a college dormitory suggest that social interaction can have a strong effect on the menstrual cycle.