Neurobiology of Addiction (2025-2026 Recording)-Neurobiology of Addiction Recording

Video Transcription

Video Summary

The session was an overview of the neurobiology of addiction, framed for clinicians and emphasizing that addiction is far more complex than a single brain region or neurotransmitter. The speaker first clarified definitions: risky use, substance use disorder, and addiction are related but not identical, and addiction is often understood as compulsive, habitual use despite harm. He stressed that addiction is a disease with identifiable symptoms, a predictable course, and brain changes caused by repeated substance use.<br /><br />A major theme was that addiction is a full-brain—and even full-body—disorder. He noted major gaps in the field, including heavy historical bias toward white men, male animals, and limited study of sex, gender, race, and social context.<br /><br />The talk then reviewed major theories of addiction. The classic dopamine hypothesis proposed that dopamine and the mesolimbic reward circuit are the basis of pleasure and drug reward. The speaker argued this model is too simplistic: dopamine is more involved in motivation, learning, and effortful seeking than in pleasure itself, and blocking dopamine does not reliably reduce drug “high.” He also discussed incentive sensitization, which separates “wanting” from “liking,” and allostasis/opponent process theory, which emphasizes stress, withdrawal, and a shift from positive to negative reinforcement. He highlighted frontal-striatal and habit-based models that bring in prefrontal cortex and dorsal striatum.<br /><br />The speaker’s main conclusion was that no single theory explains addiction for everyone. Addiction likely reflects different pathways in different people, shaped by biology, environment, and substance type. He closed by noting that future treatments may come from reverse translation, GLP-1 agonists, psychedelics, and more individualized models of care.

Keywords

addiction

neurobiology

substance use disorder

dopamine

mesolimbic reward circuit

incentive sensitization

allostasis

opponent process theory

frontal-striatal model

habit formation

prefrontal cortex

dorsal striatum

GLP-1 agonists

psychedelics