The Brain & the Actions of Cocaine, Opiates, and Marijuana

Show the "big picture." As a result of opiate actions in the nucleus accumbens (point to the sprinkles of opiates in the nuc. acc.), there are increased impulses leaving the nucleus accumbens to activate the reward system (point to the frontal cortex). As with cocaine, continued use of opiates makes the body rely on the presence of the drug to maintain rewarding feelings and other normal behaviors. The person is no longer able to feel the benefits of natural rewards (food, water, sex) and can't function normally without the drug present.