Brainstem Neurons Act as Focus Filter in Mice
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- Johns Hopkins University researchers identified inhibitory neurons in the brainstem of mice that act as a built-in focus filter, selectively ignoring distractions.
- Published in Nature Communications and selected as an editorial highlight, the study was led by senior author Shreesh Mysore and lead author Ninad Kothari.
- Ninad Kothari's team found that silencing the neurons made the mice "hyper distractable," failing to ignore faint competing visual cues — mirroring ADHD's hallmark.
- Reactivating the neurons the next day restored normal focus, and follow-up tests ruled out vision and movement issues as confounders.
- The brainstem region is evolutionarily ancient and present across all vertebrates, addressing how non-primates focus attention without a developed prefrontal cortex.
- Mysore said all evidence suggests the same neurons exist in humans; future studies will test whether they malfunction in people with ADHD or autism, guiding more targeted medications.
Why it matters: By pinpointing an ancient brainstem circuit shared across all vertebrates as essential to attention, the study offers researchers a more specific neural target than the broad brain networks hit by current ADHD medications. The finding reframes attention as a product of evolutionarily conserved brain machinery, not just the prefrontal cortex long believed to govern it.
