Cocaine Disrupted Brain Circuits Linked to Repetitive Behavior
Researchers found that cocaine hijacks existing motion-control circuits in the brain, causing rigid, repetitive actions.
Updated on Oct. 5, 2026 in Substance Abuse
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In an August 2026 study from the Hebrew University of Jerusalem, scientists discovered that repeated cocaine exposure imbalances the go and stop brain pathways. This mechanism forces mice to engage in repetitive licking behaviors, which occupied over 62% of their time after five days of exposure.
Why it matters
Understanding how drugs hijack these circuits explains why cocaine use can transform flexible behavioral choices into rigid, compulsive outputs. This research clarifies the biological basis for the loss of behavioral control often observed in substance use disorders.
This study used fiber photometry and optogenetics in mice, with the STEREO deep-learning tool classifying nine distinct action categories. The team found that daily 30 mg/kg cocaine doses disrupted the ventrolateral striatum, shifting brain activity toward compulsive output.
The players
Hebrew University of Jerusalem
A research institution in Israel hosting the Edmond and Lily Safra Center for Brain Sciences.
Edmond and Lily Safra Center for Brain Sciences
A specialized research department focused on mapping brain activity and neurobiology.
The details
Cocaine does not generate new behavioral programs but instead disrupts the natural balance between go and stop pathways in the brain. Researchers demonstrated that stimulating the stop pathway could halt these drug-induced repetitive licking behaviors in under one second. The study utilized a deep-learning tool, STEREO, to analyze movement patterns and confirm that moderate doses of 20 mg/kg affected locomotion, while higher doses specifically targeted the lower striatum.
Timeline
Over five days, mice received a daily 30 mg/kg dose of cocaine.
By day five, repetitive licking behaviors accounted for more than 62% of the total time recorded.
Health Landscape
This investigation advances the long-standing scientific effort to understand the neurobiology of addiction through the Edmond and Lily Safra Center for Brain Sciences research initiatives. It adds to the growing map of how psychoactive substances physically reorganize brain circuit activity.
This finding highlights that compulsive behaviors are rooted in tangible physical disruptions of brain circuits rather than a lack of willpower. If you or a loved one are struggling with substance use, it is worth discussing the physiological and behavioral aspects of recovery with a physician.
The takeaway
Cocaine addiction involves the biological hijacking of natural 'stop' and 'go' pathways in the brain. Recognizing that these behaviors have a physical basis can help frame the management of addiction as a medical condition requiring professional support.
Further reading
Learn more about the neurobiology of addiction in our Substance Abuse section.
More information
Read the complete scientific study in Current Biology for full methodology.
Source note: This article includes information reported by Technology Networks.
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