Human menstrual synchrony: a critical assessment/

Area of Science:

• Human Physiology
• Behavioral Science
• Social Psychology

Background:

• Menstrual synchrony, the proposed alignment of menstrual cycles among women in close proximity, has been a subject of scientific inquiry.
• Previous research has yielded mixed results, necessitating a comprehensive review of existing evidence and methodologies.
• Understanding the factors influencing menstrual synchrony is crucial for exploring potential biological and social mechanisms.

Purpose of the Study:

• To determine the existence and variations of menstrual synchrony across different social groups (e.g., roommates, friends, family).
• To quantify the effect of cohabitation on menstrual cycle synchrony.
• To investigate the influence of menstrual, social interaction, and personality factors on synchrony.
• To evaluate the support for pheromonal versus common environmental explanations for menstrual synchrony.

Main Methods:

• Systematic review of existing literature on menstrual synchrony.
• Analysis of studies involving diverse groups of women, including roommates, friends, and family members.
• Examination of methodological approaches and potential biases in previous research.

Main Results:

• The review addresses the existence of menstrual synchrony, acknowledging variations in findings across different study groups.
• It assesses the impact of shared living environments on the degree of menstrual cycle alignment.
• The influence of specific menstrual-related, social, and personality factors is explored.

Conclusions:

• The findings are evaluated in the context of supporting either a pheromonal or a common environmental basis for menstrual synchrony.
• Methodological limitations and areas for future research are discussed.
• The review provides a critical assessment of the current understanding of menstrual synchrony.