A miniature EEG node for synchronized wireless EEG sensor networks

The ability to record brain signals during daily life activities would allow to deepen our understanding of the human brain, its related pathologies (such as epilepsy and Alzheimer’s dis- ease) or develop practical and discreet brain-computer interfaces. In this paper, we present a new miniature wearable electroencephalography (EEG) sensor, of which multiple copies can be de- ployed on the scalp in a wireless mesh configuration to record brain activity. Each node in this wire- less EEG sensor network (WESN) performs a local EEG acquisition which is transmitted via Blue- tooth low energy to a smartphone. To keep coherent signals over time and avoid drifting, the nodes exchange synchronization pulses within the WESN via human body communication.