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Steady-state somatosensory evoked potentials: suitable brain signals for brain-computer interfaces?
Gernot R Müller-Putz1, Reinhold Scherer, Christa Neuper
1Laboratory of Brain-Computer Interfaces, Institute for Computer Graphics and Vision, Graz University of Technology, 8010 Graz, Austria. gernot.mueller@ieee.org
Summary
This study introduces a novel brain-computer interface (BCI) using steady-state somatosensory evoked potentials (SSSEPs) detected via tactile stimulation. Two participants achieved 70-80% accuracy, demonstrating the viability of SSSEPs for BCI applications.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Human-Computer Interaction
Background:
- Designing effective brain-computer interfaces (BCIs) requires easily detectable neural patterns.
- Steady-state evoked potentials (SSEPs), particularly visual SSEPs, are established for BCI communication.
- The potential of somatosensory evoked potentials for BCIs remains less explored.
Purpose of the Study:
- To introduce and evaluate a novel BCI system utilizing steady-state somatosensory evoked potentials (SSSEPs).
- To investigate the feasibility of using tactile stimulation to induce detectable SSSEPs for BCI control.
- To assess the accuracy and learnability of SSSEP-based BCI in human participants.
Main Methods:
- Developed a BCI system employing tactile stimulation of index fingers at somatosensory resonance frequencies.
- Utilized transducers to deliver precise tactile stimuli.
- Recruited four participants trained to modulate induced SSSEPs for BCI control.
Main Results:
- Two out of four participants successfully learned to modulate SSSEPs.
- Achieved BCI accuracy ranging from 70% to 80% in trained participants.
- Demonstrated that SSSEPs can be reliably modulated for BCI operation.
Conclusions:
- Steady-state somatosensory evoked potentials (SSSEPs) offer a viable alternative for BCI development.
- Tactile stimulation at specific frequencies can effectively induce SSSEPs for BCI.
- SSSEP-based BCIs show promising accuracy and learnability, warranting further research.