A study of in-ear electroencephalography signals additionally recorded in hospitalised patients already undergoing standard clinical electroencephalography

A hospital patient with impaired consciousness lies wired to a standard scalp EEG, while a soft earplug tucked into their ear canal simultaneously records the same brain activity for the first time. This matters because standard clinical EEG requires a technician to glue roughly 20 electrodes onto the scalp—a time-consuming, uncomfortable process that limits how often and where brain monitoring can happen. Patients with reduced consciousness, hidden seizure activity, or brain dysfunction often need prolonged monitoring, but the current setup makes that impractical outside specialised hospital wards. The researchers have already shown that in-ear EEG works in healthy volunteers during sleep; this pilot study extends that work to the very patients who would benefit most: those already undergoing clinical EEG for impaired consciousness. If the earplug signals match the scalp recordings, the impact could be straightforward: a cheap, unobtrusive device that patients can wear for days at a time, in general wards or even at home, to continuously monitor brain function without a technician present. This would not replace the full clinical EEG for diagnosis, but it could transform how clinicians track recovery, detect hidden seizures, and grade brain dysfunction over time—quietly improving a system most people never think about until they or someone they love is in a hospital bed.