Neuroscientist MARC LEWIS had first-hand knowledge of addiction when he began to study the effect of drugs on the brain. He was an addict for 15 years, starting when he was at boarding school and homesick. Over the years he tried every kind of drug from alcohol and cough syrup to LSD and heroin, sometimes stealing and forging prescriptions to feed his habit. He’s been clean for over 30 years now and has written a new memoir recounting the years of his dependency and exploring their mind-altering effect. It’s called “Memoirs of an Addicted Brain: A Neuroscientist Examines His Former Life on Drugs.” We’ll talk to Lewis about his addiction and the brain science behind it and also to Temple University addiction psychiatrist PETER DeMARIA.