Allan Herbison, University of Otago (IMAGE) University of Otago Caption Professor Allan Herbison is leader of a team discovering that neural circuitry they previously showed was vital to triggering ovulation also plays a key role in moulding the male brain. They have found that male-specific signalling in the Gonadotropin-releasing hormone (GnRH) neurons of new-born mice is crucial to generating a testosterone surge that occurs up to five hours after birth. This brief but powerful increase in testosterone blood levels, which only takes place in males, is known to cause their brains to develop differently to females. Credit Sharron Bennett Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.