Researchers Identify Neural Circuit Behind Drug Addiction Relapse

Study pinpoints role of parvalbumin-positive neurons in controlling drug-seeking behavior.

Published on Mar. 9, 2026

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Groundbreaking research from a joint team at the Korea Advanced Institute of Science and Technology (KAIST) and the University of California, San Diego (UCSD) has identified a specific neural circuit involving parvalbumin-positive (PV) inhibitory neurons that appears to control drug-seeking behavior. The study, published in Neuron, challenges long-held beliefs about addiction and suggests relapse is not simply a matter of weakened willpower or permanent brain changes, but rather an imbalance within this neural circuit.

Why it matters

This discovery offers critical insights into the neurobiology of addiction and opens the door to more targeted treatment strategies. Current addiction treatments often rely on broad approaches, but this research indicates drug addiction is a 'circuit-level problem' that could be addressed by modulating the activity of specific neurons.

The details

The researchers monitored mice exposed to cocaine and found that PV neurons became highly active when the mice sought the drug. Interestingly, this activity decreased during extinction training, suggesting the circuit isn't permanently damaged but can be readjusted. By artificially suppressing PV neuron activity, the researchers were able to significantly reduce cocaine-seeking behavior in the mice. Conversely, activating these cells caused the mice to continue seeking drugs even after training.

  • The study was published in Neuron on February 26, 2026.

The players

Korea Advanced Institute of Science and Technology (KAIST)

A leading research university in South Korea that collaborated on this groundbreaking study.

University of California, San Diego (UCSD)

A prestigious American research university that also contributed to the joint research team.

Baek Se-bum

A professor at KAIST who emphasized that the research demonstrates drug addiction is a 'circuit-level problem' caused by a collapse in the regulatory balance of specific neurons and downstream circuits.

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What they’re saying

“This discovery offers a critical lead for developing more targeted treatment strategies.”

— Baek Se-bum, Professor, KAIST

What’s next

Researchers believe similar neural circuits may be involved in other addictive behaviors, such as opioid abuse, gambling, and even food addiction. Future research will focus on developing neuromodulation techniques, pharmacological interventions, and personalized treatment plans to target the PV neuron circuit and restore balance.

The takeaway

This groundbreaking research challenges the long-held view of addiction as a matter of willpower or permanent brain changes. By identifying a specific neural circuit involved in drug-seeking behavior, it opens the door to more targeted and effective treatment strategies that could reduce cravings and prevent relapse.