US High School Psychology Complete Practice Exam 2025

Psychoactive drugs primarily make people feel good because they increase dopamine levels in the brain's reward pathway. The reward pathway is a neural circuit involving several brain regions that respond to rewarding stimuli. Dopamine acts as a neurotransmitter that plays a key role in transmitting pleasure signals within this pathway. When psychoactive substances are consumed, they can enhance the release of dopamine or mimic its effects, leading to feelings of euphoria and well-being.

Increasing dopamine levels contributes significantly to the sensation of pleasure and reinforces behaviors that are associated with the drug, making it more likely that an individual will seek out that substance again in the future. This mechanism ties into concepts of addiction, as the brain becomes conditioned to associate drug use with positive feelings, further motivating individuals to continue using the substances despite potential negative consequences. Understanding this relationship is crucial for grasping how psychoactive drugs affect both behavior and mood.