New neuroimaging research challenges a fundamental assumption about alcohol intoxication: that blood alcohol concentration (BAC) alone determines how impaired someone feels. A study published in Drug and Alcohol Dependence reveals that individual variation in brain network fragmentation—the disruption of connections between neural regions—is a stronger predictor of subjective intoxication than BAC levels.
Using functional MRI, researchers found that when two individuals reach identical BACs, their brains respond differently. This neural variability, not the blood measurement itself, better explains why one person may feel significantly more intoxicated than another. The findings suggest that future impairment assessments may need to incorporate brain-level markers alongside traditional chemical testing to provide a more accurate picture of functional impairment.
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