Recording brain activity with ear-EEG (cEEGrids)

The cEEGrid (ear-electroencephalography; ear-EEG) is an unobtrusive and comfortable electrode array affixed around the ear. It is suited to investigate brain activity outside of the laboratory for long durations. Previous research established that cEEGrids can be used to study various cognitive processes in and also beyond the lab, even for a whole day. To record high-quality ear-EEG data, careful preparation is necessary. In this protocol, we explain the steps needed for successful experimenting with cEEGrids: First, we show how to test the functionality of the cEEGrid prior to a recording. Second, we describe how to prepare the participant and to fit the cEEGrid, which is the most important step to record high-quality data. Third, we outline how to connect the cEEGrids to the amplifier and how to check the signal quality. In this protocol, we give best practice recommendations and tips that make cEEGrid recordings easier. If researchers follow this protocol, they are comprehensively equipped for experimenting with the cEEGrid in and beyond the lab. SUMMARY The cEEGrid (ear-electroencephalography) allows to record brain activity in and beyond the lab for extended duration. In this protocol, we describe how to set up and record with cEEGrids. ### Competing Interest Statement The authors have declared no competing interest.