Scientists discover new way the brain learns

Neuroscientists have uncovered a second learning system in the brain, complementing the known reward prediction error (RPE) system. This new action prediction error (APE) system updates the frequency of action performance. The discovery, made through experiments on mice, reveals dopamine signals in the striatum's tail drive this system. This dual learning mechanism could explain habit formation and potentially inform new approaches to treating addiction and Parkinson's disease.