The mental prosthesis: Assessing the speed of a P300-based brain-computer interface
The mental prosthesis: Assessing the speed of a P300-based brain-computer interface
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DOI：
10.1109/86.847808
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发表时间：
2000-06-01
期刊：
影响因子：
--
通讯作者：
Wijesinghe, R
中科院分区：
文献类型：
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作者：
Donchin, E;Spencer, KM;Wijesinghe, R
我们描述了一项旨在评估脑机接口（BCI）的研究，该研究最初由法威尔和唐钦[9]在1988年描述。该系统利用了oddball范式中的罕见事件引出事件相关电位（ERP）的P300成分的事实。BCI向用户呈现一个由6 × 6单元组成的矩阵，每个单元包含字母表中的一个字母。用户将注意力集中在包含要传达的字母的单元格上，同时矩阵的行和列被强化。每一次强化都是一个奇数序列中的事件，包含被关注细胞的行和列是“罕见”项目，因此，只有这些事件才能引发P300。因此，计算机通过确定哪一行和哪一列引起P300来检测所传输的字符。我们报告的评估，使用自举的方法，这表明该系统的离线版本可以在每分钟7.8个字符的速率进行通信，并达到80%的准确率。系统的性能在真实的时间也进行了评估。我们的数据表明，基于P300的BCI是可行的和实用的。然而，这些结论是基于对健康个体的测试。
We describe a study designed to assess a brain-computer interface (BCI), originally described by Farwell and Donchin [9] in 1988. The system utilizes the fact that the rare events in the oddball paradigm elicit the P300 component of the event-related potential (ERP). The BCI presents the user with a matrix of 6 by 6 cells, each containing one letter of the alphabet. The user focuses attention on the cell containing the letter to be communicated while the rows and the columns of the matrix are intensified. Each intensification is an event in the oddball sequence, the row and the column containing the attended cell are "rare" items and, therefore, only these events elicit a P300. The computer thus detects the transmitted character by determining which row and which column elicited the P300. We report an assessment, using a bootstrapping approach, which indicates that an off line version of the system can communicate at the rate of 7.8 characters a minute and achieve 80% accuracy. The system's performance in real time was also assessed. Our data indicate that a P300-based BCI is feasible and practical. However, these conclusions are based on tests using healthy individuals.