Influence of Word Presentation via Stereo Loudspeakers in an Auditory ERP Paradigm for Brain-Computer Interfaces
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2022-07-04
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en
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Brain-computer interfaces (BCI) allow users to interact or communicate with their environment
without depending on motoric output pathways. By classifying and translating
neurophysiological signals into command signals for an external device, BCI users can control
applications such as a wheelchair, spelling program, or prosthesis. Auditory BCI systems detect
attention to auditory stimuli based on the event-related potentials in electroencephalography
(EEG) signals. These auditory BCI systems can be used for cognitive rehabilitation. Musso et al.
(2022) developed a novel language training paradigm for aphasia rehabilitation in stroke
patients using an EEG-based BCI system. In their approach, patients are given individual and
immediate brain-state-dependent feedback during an auditory detection task, which serves as
an indicator of their task success. Hence, the approach exploits the notion that reinforcing an
appropriate language processing strategy may induce beneficial brain plasticity. During the
language training task, patients sit in a ring of six loudspeaker, which present the auditory
stimuli. However, his set-up is not feasible for at home- or practitioner-based training. Therefore,
the present study will explore the possibility of a simplified audio set-up with stereo headphones
by investigating the differences in offline classification accuracy and ERP components in the
described experimental set-up. In a within-subject study design, eight healthy participants tested
the proposed BCI paradigm in four audio conditions: six loudspeakers, stereo headphones,
stereo headphones incorporating pitch, and mono headphones. Results show that the stereo
headphones incorporating pitch are comparable to the six loudspeakers in terms of offline
classification accuracy.
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Faculteit der Sociale Wetenschappen