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A practical, intuitive brain-computer interface for communicating 'yes' or 'no' by listening.

N Jeremy Hill1, Erin Ricci, Sameah Haider

  • 1Wadsworth Center, New York State Department of Health , Albany, NY, USA. Helen Hayes Hospital, West Haverstraw, NY, USA.

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Summary

This study shows that using spoken words like "yes" and "no" in auditory brain-computer interface (BCI) systems is as effective as abstract sounds. This makes BCIs more intuitive for users, including those with locked-in syndrome.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Rehabilitation Technology

Background:

  • Auditory brain-computer interface (BCI) systems traditionally use abstract stimuli.
  • Abstract stimuli can be perceived as unpleasant and unintuitive, hindering user experience.
  • Previous BCI research focused on EEG-based systems driven by attention shifts to auditory stimuli.

Purpose of the Study:

  • To evaluate the feasibility of using spoken words ('yes', 'no') as stimuli in auditory streaming BCI systems.
  • To compare performance between word-based and beep-based auditory BCI systems.
  • To assess the potential of word-based BCI for individuals with locked-in syndrome.

Main Methods:

  • A within-subject comparison of auditory streaming BCI using beep versus word stimuli.
  • Fourteen healthy volunteers participated in counterbalanced, interleaved sessions.
  • Preliminary data collected from two individuals with amyotrophic lateral sclerosis (ALS) using the word-based system.

Main Results:

  • Event-related potentials (N1, N2, P3) showed greater inter-subject variability with words than beeps.
  • The distinction between attended and unattended stimuli was more consistent with word stimuli.
  • Healthy subjects achieved slightly better performance with word stimuli (77%) compared to beep stimuli (73%).
  • Individuals with ALS demonstrated comparable accuracy to healthy subjects using the word-based BCI.

Conclusions:

  • Auditory streaming BCI systems using spoken words are recommended for improved user pleasantness and intuitiveness.
  • Word-based BCI performance is comparable to, and potentially better than, systems using abstract stimuli.
  • Word-based auditory streaming BCI shows promise as a communication tool for individuals with locked-in syndrome.