Dopamine Overdose! Why Doctors Over-Prescribe Drugsbr UC Berkeley Extension - UC Berkeley Extensionbr Get an introduction to the latest scientific findings on addiction’s effect on the brain in an incisive talk by UC Berkeley professor, Mark D’Esposito. Understand how certain circuits in the brain that normally guide goal-directed behavior are malfunctioning in the throes of addiction. Dr. Esposito also explains novel cognitive and pharmacological treatments in clinical settings.