EEG can't match implanted BCIs: physics caps scalp signals at ~70Hz
EricMTrautmann · x · 2026-11-11
A BCI researcher explains why EEG physically can't measure the same brain signals as implanted BCIs, no matter how much AI you apply. Spatial averaging filters out high-frequency neural activity before it reaches the scalp: anything above 70Hz (research-grade) or 20Hz (consumer) sits below the noise floor.
Implanted electrodes resolve far higher: 200Hz epidural, 600Hz ECoG, up to 2kHz penetrating. The analogy: inferring high-frequency brain signals from EEG is like guessing lyrics of a song you've never heard from the bassline. EEG remains useful, but pretending it matches implants defies physics. An attached power spectral density chart contrasts scalp EEG vs ECoG floors.
Related event: Researchers Debate Whether EEG Can Overcome Its Physical Limits(2 posts)→
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