Yesterday’s noise may be tomorrow’s signal: Where are today’s limits for high-resolution high-frequency surface EEG?

Recent intracranial EEG recordings revealed that frequencies above 100 Hz convey signals highly informative for application scenarios as diverse as movement decoding for Brain-Computer Interfaces and focus localization in cases with neocortical epilepsies. While such novel concepts are advancing rapidly, they still rely on technology that has been optimised for the conventional, i.e., low-frequency (< 100 Hz), EEG. However, such clinical routine recordings are compromised by a progressively decreasing signal-to-noise ratio for higher frequencies; in particular, the non-invasive detection of scalp EEG signals at…