EEG data closed and open eyes: OpenBCI Cyton and EEG Prototype

Abstract

The participant group included a total of seven vol-unteers  (males)  who  agreed  to  participate  in  theresearch. Their mean age was 29.67 (range 24–56).The  participants indicated  that  they  do  not  havehearing or visual impairments. Participation was vol-untary and informed consent was obtained for eachparticipant in order to employ their EEG data in ourstudy. We captured the brain activity of the subjects with the proposed EEG prototype (see [1]) and the OpenBCI Cyton board. Gold cup electrodes  were  placed  in  accordance  with  the  10–20 international system for electrode placement andattached to  the subjects  scalp  using a  conductive paste. Electrode-skin impedances were checked to bebelow 15 kΩ at all electrodes. Several studies have proved that the alpha rhythm predominates in the occipital  area  of  the  brain  when  subjects  remain with their eyes closed and it is reduced when visualstimulation  takes  place. In  accordance with these works, the input channel of the prototype was located in the O2 position. Moreover, to reduce the setup  time  and  improve  the  EEG  signal  quality, the reference and ground electrodes were placed inthe FP2 and A1 positions, respectively, where the absence of hair facilitates its placement. All the experiments were conducted in a sound-attenuated and controlled environment. Participants were seated in a comfortable chair and asked to be relaxed and focused on the task, trying to avoid any distraction or external stimulus. Experiments were composed of 2 tasks: the first one, 60 s of oE and the second, 60 s of cE. Each task was separated by a pause of at least 3 s to ensure the participant is rested before a new task. In order to simulate a real-life situation, the subject could move his gaze freely during the eye-open tasks, without the need to keep it at a fixed point. The procedure was conveniently explained in advance allowing the participants to feel comfortable and familiar with the test environment. Possible artifacts were minimized by asking them not to speak, move or blink (or atleast as little as possible) throughout the oE task. A total of 10 tasks (i.e. 10 min) were recorded for each participant, which corresponds to five tasks of oE and five tasks of cE.   Data is organized in a folder for each subject (S1, S2, S3, etc.). Inside each subject folder we find two different folders: PP: which contains the recordings captured with the proposed prototype. OPB: which contains the recordings captured with the Cyton board. Inside each of these folders we will find 10 files: 5 corresponding to open eyes and closed eyes. The name of these files follows the structure: Closed eyes: cerrados[# recording]_[# subject].csv Open eyes: abiertos[# recording]_[# subject].csv Each .csv file contains 2 data columns: timestamp and O2 channel. [1] Laport, F., Dapena, A., Castro, P. M., Vazquez-Araujo, F. J., & Iglesia, D. (2020). A prototype of EEG system for IoT. International journal of neural systems, 30(07), 2050018. DOI: https://doi.org/10.1142/S012906572050018