Building Brain Invaders: EEG data of an experimental validation

Building Brain Invaders: EEG data of an experimental validation

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GFP. Van Veen, A. Barachant, A. Andreev, G. Cattan, P. Rodrigues, M. Congedo GIPSA-lab, CNRS, University Grenoble-Alpes, Grenoble INP. Address : GIPSA-lab, 11 rue des Mathématiques, Grenoble Campus BP46, F-38402, France

Keywords: Electroencephalography (EEG), P300, Brain-Computer Interface, Experiment.

Abstract - We describe the experimental procedures for a dataset that we have made publicly available at https://doi.org/10.5281/zenodo.2649006 in mat and csv formats. This dataset contains electroencephalographic (EEG) recordings of 25 subjects testing the Brain Invaders (1), a visual P300 Brain-Computer Interface inspired by the famous vintage video game Space Invaders (Taito, Tokyo, Japan). The visual P300 is an event-related potential elicited by a visual stimulation, peaking 240-600 ms after stimulus onset. EEG data were recorded by 16 electrodes in an experiment that took place in the GIPSA-lab, Grenoble, France, in 2012 (2,3). Python code for manipulating the data is available at https://github.com/plcrodrigues/py.BI.EEG.2012- GIPSA. The ID of this dataset is BI.EEG.2012-GIPSA.

Résumé - Dans ce document, nous décrivons une expérimentation dont les données ont été publiées à https://doi.org/10.5281/zenodo.2649006 aux formats mat et csv. Ce jeu de donnée contient les enregistrements électroencéphalographiques (EEG) de 25 sujets testant Brain Invaders (1), une interface cerveau-ordinateur de type ‘P300 visuel’ inspirée du fameux jeu vintage Space Invaders (Taito, Tokyo, Japan). Le P300 visuel est une perturbation du signal EEG apparaissant 240-600 ms après le début d’une stimulation visuelle. L’EEG de chaque sujet a été enregistré grâce à 16 électrodes réparties sur la surface du scalp. L’expérience a été menée au GIPSA-lab (Université de Grenoble-Alpes, CNRS, Grenoble-INP) en 2012 (2,3). Nous fournissons également une implémentation python pour manipuler les données à https://github.com/plcrodrigues/py.BI.EEG.2012-GIPSA . L’identifiant de cette base de données est BI.EEG.2012-GIPSA.

Introduction The visual P300 is an event-related potential (ERP) elicited by a visual stimulation, peaking 240-600 ms after stimulus onset. The experiment was designed to validate the game design of Brain Invaders (1), a visual P300 Brain-Computer Interface inspired by the famous vintage video game Space Invaders (Taito, Tokyo, Japan). The Brain Invaders is based on a P300-based brain-computer interface (BCI) working on a PC. In (1,2) these data were classified using the xDAWN spatial filter (4). This experiment features a training-test mode of operation and both a longitudinal and transversal design. An example of applications of this dataset can be seen in https://github.com/plcrodrigues/py.BI.EEG.2013-GIPSA . Other datasets of Brain Invaders experiment are presented in (5,6). For example, reference (5) features both a training-test (classical) mode of operation and a calibration-less mode of operation, as described in (7– 9). This is the first experiment ever carried out using the Brain Invaders. The complete list of experiments is available at https://sites.google.com/site/marcocongedo/science/eeg-data .

Participants 26 subjects participated in the experiment (7 females), with mean (sd) age 24.4 (2.76). The youngest subject was 21 and the oldest 31. One subject was excluded from the study due to material issues during the experiment. Half of them played games occasionally, that is, around 4.5 hours a week. All subjects were volunteers recruited by means of flyers and of the mailing list of the University of Grenoble-Alpes. All participants provided written informed consent confirming the notification of the experimental process, the data management procedures and the right to withdraw from the experiment at any moment.

Material EEG signals were acquired by means of the NeXus-32 (MindMedia, Herten, Germany), a research-grade amplifier and EEG headset. The cap was equipped with 16 Silver/Silver Chloride wet electrodes, placed according to the 10-20 international system (Figure 1). The locations of the electrodes were F7, F3, F4, F8, T7, C3, CZ, C4, T8, P7, P3, PZ, P4, P8, O1 and O2. The ground was placed at the FZ scalp location. The NeXus-32 machine is produced by Twente Medical Systems International B.V. (TMSi, Enschede, The Netherlands). It does not use an electrode as reference, rather, a, hardware common average reference is used. The amplifier was linked by USB connection to the PC where the data were acquired by means of the software OpenVibe (10,11). Data were acquired at a sampling frequency of 128 samples per second. For ensuing analysis, the application tagged the EEG using software tagging. The tags were sent by the application to the OpenVibe plateform thanks to the Boost inter-process messaging (12). Note that the tag

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