A Wireless E-Tattoo for Motion-Resistant EEG and EOG from the Forehead

Electroencephalography (EEG) measured from the human forehead can noninvasively assess activity from the prefrontal cortex (PFC), which is involved in executive functions, attention, and emotion regulation. Eye movement induced elec-troculography (EO G) can also be recorded from the forehead. Both EEG and EOG can enable a variety of applications such as brain-computer interfaces (BCI) and human status monitoring. However, conventional brain-monitoring wearables including rigid and flexible headbands form unstable electrode-skin contacts, resulting in significant noise, especially under motion. In this work, we introduce a thin, lightweight, skin-conformal, and low-power wireless electronic tattoo (e-tattoo) that can be deployed in general forehead EEGIEOG applications without being limited by signal quality, battery life, or motion.