An auditory multiclass brain-computer interface with natural stimuli: Usability evaluation with healthy participants and a motor impaired end user.

For the multiclass error distribution of individual tones, chi-square tests did not yield significant results, however, a trend toward significance (χ 2 = 7.56, p = 0.056) was revealed for the singing bird sound, where multiclass errors were lowest for duck, four errors, and highest for seagull, 14 errors.

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