NYU Langone Health / NYU Grossman School of Medicine Jan 24 2025 Like humans, mice will compete over territory and mates, and show increased confidence in their fighting skills the more they win. At first, a brain chemical called dopamine is essential for young males to master this behavior. But as they gain experience, the chemical grows less important in promoting aggression, a new study shows. Dopamine has been linked to male aggression for decades. How past experiences might influence this