Lay summary
The brain controls everything we do. Analysis of brain activities (electro-encephalograms (EEG)), taps into the ultimate biometric, with the potential to assess every physical and mental state we experience. Despite a rich accumulation of EEG research in the laboratory, direct translational use of well-understood EEG-behaviour relationships remain poorly utilised. Conventional EEG recording equipment takes specialists up to an hour to set-up correctly and consistently, and available mobile EEG solutions are obtrusive, and prone to artefact from motion and electrical noise in our surroundings. We will address the shortcomings of currently available EEG recording techniques by developing and validating an in-ear recording site for EEG. A viable in-ear EEG recording could be administered correctly by the end-user with ease, worn unobtrusively, and record chronically on-the-go, potentially for days. This approach will revolutionise how EEG, as the brain biometric, can be used as a diagnostic, monitoring and neurofeedback treatment tool for brain