(IsraelNN.com) A researcher at the University of Haifa has discovered that the hormone oxytocin, also known as the "love hormone," can trigger negative emotions such as jealousy as well. Oxytocin is released naturally in the body during childbirth, lactation and when engaging in intimate relations. Participants in a previous experiment who inhaled a synthetic form of the hormone displayed higher levels of altruistic feelings. However, it was also discovered in earlier studies on rodents that the hormone may be linked to higher levels of aggression as well.