infradian rhythms

• S: McClinstock found 135 women who lived in the same dormitory at university appeared to synchronise their cycles w/ their friendship groups suggesting the menstrual cycle infradian rhythm synchronises
• L: while the use of pheromones as a chemical messaging system is common in animals it is not widely accepted among scientists that humans have the ability to detect these signals
• L: as menstrual cycles can vary in length women can appear to synchronise just due to their variability in their cycles something not taken into consideration in all of the studies showing positive results