Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany.
Clin Neurophysiol. 2013 Feb;124(2):327-38. doi: 10.1016/j.clinph.2012.08.006. Epub 2012 Sep 7.
The main objective of the current study was to implement and evaluate a P300 based brain-computer interface (BCI) speller that uses directional cues of auditory stimuli, which are presented over headphones. The interstimulus interval (ISI) was successively reduced to determine the optimal combination of speed and accuracy. The study further aimed at quantifying the differences in subjective workload between the auditory and the visual P300 spelling application. The influence of workload, mood and motivation on BCI performance and P300 amplitude was investigated.
Twenty healthy participants performed auditory and visual spelling tasks in an EEG experiment with online feedback.
Sixteen of twenty participants performed at or above a level necessary for satisfactory communication (≥70% spelling accuracy) with the auditory BCI. Average bit rates of up to 2.76 bits/min (best subject 7.43 bits/min) were achieved. A significantly higher workload was reported for the auditory speller compared to the visual paradigm. Motivation significantly influenced P300 amplitude at Pz in the auditory condition.
The results of the online study suggest that the proposed paradigm offers a means of communication for most healthy users.
The described auditory BCI can serve as a communication channel for completely paralyzed patients.
本研究的主要目的是实现和评估一种基于 P300 的脑-机接口（BCI）拼写器，该拼写器使用听觉刺激的方向线索，通过耳机呈现。通过逐步减小刺激间间隔（ISI）来确定速度和准确性的最佳组合。该研究还旨在量化听觉和视觉 P300 拼写应用之间主观工作负荷的差异。研究了工作负荷、情绪和动机对 BCI 性能和 P300 幅度的影响。
二十名健康参与者在具有在线反馈的 EEG 实验中进行了听觉和视觉拼写任务。
在听觉 BCI 中，有 16 名参与者的表现达到或超过了令人满意的沟通所需的水平（≥70%的拼写准确性）。达到了高达 2.76 位/分钟的平均比特率（最佳受试者为 7.43 位/分钟）。与视觉范式相比，报告的听觉拼写器的工作负荷明显更高。在听觉条件下，动机显著影响 Pz 处的 P300 幅度。
在线研究的结果表明，所提出的范式为大多数健康用户提供了一种沟通方式。
描述的听觉 BCI 可以作为完全瘫痪患者的通信通道。
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