Chromatic and High-frequency cVEP-based BCI Paradigm

TL;DR

This paper introduces a high-frequency, chromatic cVEP-based BCI paradigm using LED stimuli to improve safety and performance, comparing it with traditional flicker-based interfaces.

Contribution

It proposes a novel high-frequency, chromatic stimulation method for cVEP-BCI using LEDs, enhancing safety and potentially improving accuracy.

Findings

High-frequency green-blue stimuli reduce PSE risk.

Chromatic cVEP yields comparable or better accuracy than white-black flicker.

LED-driven stimuli enable flexible, safe BCI designs.

Abstract

We present results of an approach to a code-modulated visual evoked potential (cVEP) based brain-computer interface (BCI) paradigm using four high-frequency flashing stimuli. To generate higher frequency stimulation compared to the state-of-the-art cVEP-based BCIs, we propose to use the light-emitting diodes (LEDs) driven from a small micro-controller board hardware generator designed by our team. The high-frequency and green-blue chromatic flashing stimuli are used in the study in order to minimize a danger of a photosensitive epilepsy (PSE). We compare the the green-blue chromatic cVEP-based BCI accuracies with the conventional white-black flicker based interface.