> Two Learning Systems in the Brain Reveal How Habits Are Formed

Summary: The brain uses two separate dopamine-based learning systems: one for evaluating outcomes and another for reinforcing repeated actions. Known as reward prediction error (RPE) and action prediction error (APE), these systems help explain how habits form and why they can become difficult to break.

https://neurosciencenews.com/habit-formation-systems-neuroscience-28928/