Robotic Wheelchair Commanded by People with Disabilities Using Low/High-Frequency SSVEP-based BCI

MULLER, S.; DIEZ, P.; FREIRE BASTOS T.; SARCINELLI FILHO M.; MUT V.; LACIAR E.; AVILA E.

Graz

Congreso; 6th International Brain-Computer Interface Conference 2014; 2014

Graz University

This work presents a comparative study between low and high frequencies of visual stimulation used in a Brain-Computer Interface (BCI) based on Steady State Visual Evoked Potentials (SSVEP). This comparison has the goal of evaluating the visual tiredness produced by ickering visual stimuli in two distinct frequency ranges (low and high frequency). For this purpose, ve volunteers with disabilities operated a wheelchair through a SSVEPbased BCI. In the experiments, each subject answered a questionnaire about performance and tiredness associated to the use of the BCI. Average ITR obtained for low- and highfrequency stimuli were 20.3 bits/min and 15.0 bits/min, respectively. Despite of a lower average ITR, it was found that high-frequency stimuli were more comfortable and could lead to a better performance in the accomplishment of the navigation tasks.