It is believed that most drugs with abuse potential enhance pleasure centers by causing the release of ________.

• A. Serotonin
• B. Dopamine
• C. Norephinephrine
• D. Adrenalin

Answer: (B)

Dopamine is the neurotransmitter most closely tied to the brain’s reward and reinforcement system. Many drugs of abuse increase dopamine release in the mesolimbic pathway, especially from the ventral tegmental area to the nucleus accumbens, which produces pleasurable feelings and strengthens the behavior of taking the drug. Serotonin affects mood and some drugs influence it, but it isn’t the primary driver of the rewarding experience linked to abuse. Norepinephrine and epinephrine are more about arousal and stress responses than the core reward signal. So, the mechanism most consistently linked to the abuse potential of many drugs is dopamine release in reward circuits.