An application framework for controlling an avatar in a desktop-based virtual environment via a software ssvep brain--computer interface

Authors:
Josef Faller;Gernot Müller-Putz;Dieter Schmalstieg;Gert Pfurtscheller
Affiliations:
-;Institute for Knowledge Discovery, BCI Lab, Graz University of Technology, Graz, Austria;Institute for Computer Graphics and Vision, Graz University of Technology, Graz, Austria;Institute for Knowledge Discovery, BCI Lab, Graz University of Technology, Graz, Austria
Venue:
Presence: Teleoperators and Virtual Environments
Year:
2010

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Abstract

This paper presents a reusable, highly configurable application framework that seamlessly integrates SSVEP stimuli within a desktop-based virtual environment (VE) on standard PC equipment. Steady-state visual evoked potentials (SSVEPs) are brain signals that offer excellent information transfer rates (ITR) within brain--computer interface (BCI) systems while requiring only minimal training. Generating SSVEP stimuli in a VE allows for an easier implementation of motivating training paradigms and more realistic simulations of real-world applications. EEG measurements on seven healthy subjects within three scenarios (Button, Slalom, and Apartment) showed that moving and static software generated SSVEP stimuli flickering at frequencies of up to 29 Hz proved suitable to elicit SSVEPs. This research direction could lead to vastly improved immersive VEs that allow both disabled and healthy users to seamlessly communicate or interact through an intuitive, natural, and friendly interface.