Self-development-oriented competitiveness fluctuates across the menstrual cycle, according to new research published in Adaptive Human Behavior and Physiology. But hormonal contraceptives appear to interfere with this effect. “I’ve always been really interested in what drives behaviour but, over time, I have been more and more interested in the relationship between the brain and our biology,” said study author Lindsie Catherine Arthur, a PhD candidate at The University of Melbourne. Hormones play an important role in lots of biological processes, like growth and development or sexual function....
