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Optimising non-invasive brain-computer interface systems for free communication between naïve human participants
Angela I Renton1, Jason B Mattingley2,3,4, David R Painter3
1Queensland Brain Institute, The University of Queensland, St Lucia, 4072, Australia. angie.renton23@gmail.com.
Scientific Reports
|December 12, 2019
Summary
This study developed a new brain-computer interface (BCI) speller for free communication. Naïve users experienced slower typing rates during free communication compared to cued tasks, highlighting usability needs.
Area of Science:
- Neuroscience
- Human-Computer Interaction
- Assistive Technology
Background:
- Brain-computer interfaces (BCI) offer a non-manual alternative for computer interaction.
- Current BCI spellers achieve high rates but often with experienced users and repetitive tasks.
- The feasibility of BCI spellers for genuine free communication with naïve users remains unclear.
Purpose of the Study:
- To develop and evaluate an open-source, non-invasive BCI speller for free communication.
- To assess typing performance of naïve users during free communication tasks.
- To identify factors influencing BCI speller usability and accuracy for natural conversation.
Main Methods:
- Developed a non-invasive BCI speller using a flickering keyboard and filter-bank canonical correlation analysis.
- Conducted two experiments with naïve users performing prompted word association and a messaging interface task.
- Measured information transfer rates and evaluated factors affecting communication efficacy.
Main Results:
- Information transfer rates were lower during free communication (word association) than cued character typing.
- Free communication via a messaging interface was possible but further reduced by textual corrections and conversational turn-taking.
- Usability and classification accuracy were identified as key factors for BCI speller performance.
Conclusions:
- BCI spellers show potential for free communication but require optimization for usability.
- Future BCI speller evaluations should prioritize genuine free communication scenarios over simplified tasks.
- Focusing on usability improvements is crucial for advancing BCI technology for natural human interaction.
