Psychophysical Responses Comparison in Spatial Visual, Audiovisual, and Auditory BCI-Spelling Paradigms

TL;DR

This study compares psychophysical and EEG responses across visual, audiovisual, and auditory BCI spelling paradigms, showing auditory-only BCI performance comparable to visual and audiovisual methods.

Contribution

It provides preliminary evidence that auditory-only BCI can match visual and audiovisual BCI performance, expanding options for BCI speller paradigms.

Findings

Auditory BCI performs as well as visual and audiovisual BCI.

Psychophysical response variability is evaluated.

Preliminary EEG results support auditory BCI viability.

Abstract

The paper presents a pilot study conducted with spatial visual, audiovisual and auditory brain-computer-interface (BCI) based speller paradigms. The psychophysical experiments are conducted with healthy subjects in order to evaluate a difficulty and a possible response accuracy variability. We also present preliminary EEG results in offline BCI mode. The obtained results validate a thesis, that spatial auditory only paradigm performs as good as the traditional visual and audiovisual speller BCI tasks.