Trigeminal nerve stimulation boosted memory in Leuven study — SkimNews
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- Myles McLaughlin at the Leuven Brain Institute led a study finding that 1-second bursts of 200-Hz stimulation to the trigeminal nerve raised hippocampal neuron signaling by about 20% in anaesthetised rats, with effects lasting at least 90 minutes, while continuous 100-Hz stimulation had no effect.
- The researchers linked the effect to activation of the locus coeruleus, the brain's primary noradrenaline producer; chemically suppressing that structure eliminated the lasting hippocampal increase.
- Nine epilepsy patients with implanted electrodes showed a similar hippocampal electrical response when skin electrodes around their jaw delivered the same 200-Hz pattern for 20 minutes.
- Thirty-six healthy adults recalled roughly one extra occupation association at the 20-minute mark after stimulation versus a sham session, though name recall showed no improvement — McLaughlin suggests occupations conjure vivid images (e.g. classrooms) that aid consolidation while names lack such hooks.
- Siyar Bahadir at The Feinstein Institutes called the cross-species design — rat synaptic recordings to direct human hippocampal recordings to healthy-volunteer memory testing — "more convincing."
- The team is now comparing trigeminal nerve stimulation to median nerve stimulation in the arm in up to 40 volunteers to test whether peripheral nerve stimulation more broadly aids memory.
Why it matters: A skin-electrode approach targeting the trigeminal nerve could become a far more accessible, non-invasive alternative to existing memory-boosting stimulation that requires surgery or scanners. The catch: the effect was modest — about one extra association — and selective, improving occupation recall but not names, so larger trials are needed before wearable deployment becomes realistic.
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