A new study from Kyoto University reveals that habit formation is driven by two separate brain circuits: one decides whether a behavior becomes a habit, and another controls how intensely that habit is performed. The research, published in July 2026, used an accelerated training protocol to observe neural changes in mice within just four days.
The Research
Researchers led by Nozomi Asaoka trained mice to perform a goal-directed task, then gave them four extra days of training to induce automatic habits. By comparing brain activity before and after habituation, they found that neurons connecting the anterior cingulate cortex (ACC) to the retrosplenial cortex (RSC) became weaker as habits formed. This circuit acts as a gatekeeper: when its connections weaken, a behavior transitions from deliberate to automatic.
The second circuit, from the lateral orbitofrontal cortex (lOFC) to the central striatum (CS), controls how much the habit is executed. Mice with stronger activity in this circuit performed the habit more frequently and intensely, while those with weaker responses showed reduced execution. By artificially stimulating or suppressing these pathways, the team could induce habit formation or alter execution volume on demand, proving their distinct roles.
This accelerated protocol allowed direct intra-subject mapping of neural transitions, overcoming previous difficulties in tracking habit formation over long periods. The findings explain why some people develop strong habits while others form weaker ones, and they highlight new targets for treating compulsive disorders like obsessive-compulsive disorder (OCD) and addiction.
Why It Matters
Understanding these circuits helps explain why you might easily form a strong exercise habit while struggling to make studying automatic. Your lOFC-to-CS pathway's strength may determine how intensely you perform a habit once it's established. The research also provides a neural basis for why some habits feel uncontrollable—in OCD, this circuitry might be overactive.
For anyone looking to build better habits, this study suggests that habit formation isn't just about repetition: the initial transition depends on weakening the ACC-RSC connection, while execution strength depends on the lOFC-CS pathway. Interventions that target these circuits—such as mindfulness or cognitive training—could potentially help both habit formation and reduction.
What You Can Do
To leverage this knowledge, focus on consistent repetition in a stable context to encourage the weakening of gatekeeper circuits. Once a habit forms, track your execution frequency—if you want to strengthen a habit, find ways to increase its reward value to engage the lOFC-CS pathway.
Source: Neuroscience News
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