A German study has determined that fluctuating hormone levels influence a womanâ€™s inclination to share her personal resources as well as her willingness to cooperate.
Fluctuating hormone levels change a woman’s social behavior over the course of the menstrual cycle. Mood swings and irritability before the period as well as a greater interest in sex during ovulation are well known.
In the new research, psychologists at the Goethe University performed two online studies involving over 400 German and US American women.
To qualify for the study, the participants had to have a natural menstrual cycle, in other words not be using hormone-based contraceptives, had to not be pregnant, and not have entered menopause yet.
The researchers compared the willingness to cooperate between women in the time during and shortly after menstruation (early follicular phase), when the levels of the hormones estrogen and progesterone are low, and a few days after ovulation (midluteal phase), when the estrogen and progesterone levels are especially high.
The hormone levels were estimated based on the self-reported day in the cycle.
The researchers measured the subjects’ individual willingness to cooperate using a well-established psychological scale, the “Social Value Orientation”. To do this, they asked the women to divide fictitious money between themselves and another person who was a complete stranger to them.
“Numerous studies have shown that people who exhibit a high willingness to share in this test also donate money more often and in larger amounts in real life, take the train instead of the car to work more often, and are more willing to compromise in negotiations than people with a less pronounced pro-social value orientation”, explains Christine Anderl, lead author of the study.
The two studies showed that the women were significantly more inclined to share their own resources with a stranger during and shortly after menstruation than they were a few days after ovulation.
The greater the cycle-dependent level of the “female” sex hormone estrogen, the lower the willingness to share of the women on a purely statistical basis.
“While we are firmly convinced that the variation in the willingness to share over the course of the cycle is a real and systematic effect, we still have to determine whether or not it is really caused by estrogen as the present data suggest”, says Anderl.
“This matches the findings of other research groups, who were able to show that hormones such as oxytocin and the “male” sex hormone testosterone affect the willingness to cooperate in humans”, Prof. Sabine Windmann from the Institute for Experimental Psychology 2 at the Goethe University commented.
Researchers admit that how strongly the cycle-dependent fluctuations in the willingness to cooperate affect the day-to-day life of women will have to be researched in further studies.
However, the researchers have already found initial evidence which suggests that the described effects also occur when the subjects are using real money.
Researchers believe these results are interesting given the large use of hormonal contraception and the lack of knowledge by which the synthetic hormones affect brain receptors. As such they call for additional research to study how the manufactured hormones may influence the behavior of women.