DIY hybrid SSVEP-P300 LED stimuli for BCI platform using EMOTIV EEG headset

Surej Mouli; Ramaswamy Palaniappan

doi:10.1016/j.ohx.2020.e00113

DIY hybrid SSVEP-P300 LED stimuli for BCI platform using EMOTIV EEG headset

HardwareX. 2020 May 22:8:e00113. doi: 10.1016/j.ohx.2020.e00113. eCollection 2020 Oct.

Authors

Surej Mouli¹, Ramaswamy Palaniappan¹

Affiliation

¹ Data Science Research Group, School of Computing, University of Kent.

Abstract

A fully customisable chip-on board (COB) LED design to evoke two brain responses simultaneously (steady state visual evoked potential (SSVEP) and transient evoked potential, P300) is discussed in this paper. Considering different possible modalities in brain-computer interfacing (BCI), SSVEP is widely accepted as it requires a lesser number of electroencephalogram (EEG) electrodes and minimal training time. The aim of this work was to produce a hybrid BCI hardware platform to evoke SSVEP and P300 precisely with reduced fatigue and improved classification performance. The system comprises of four independent radial green visual stimuli controlled individually by a 32-bit microcontroller platform to evoke SSVEP and four red LEDs flashing at random intervals to generate P300 events. The system can also record the P300 event timestamps that can be used in classification, to improve the accuracy and reliability. The hybrid stimulus was tested for real-time classification accuracy by controlling a LEGO robot to move in four directions.

Keywords: Assistive control; Brain-computer interface; Emotiv; Hybrid BCI; LED radial stimulus; LEGO; Oddball; P300 event marker; Real-time control; SSVEP; Steady-state visual evoked potential; Visual fatigue.