Online use of error-related potentials in healthy users and people with severe motor impairment increases performance of a P300-BCI
Online use of error-related potentials in healthy users and people with severe motor impairment increases performance of a P300-BCI
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DOI：
10.1016/j.clinph.2011.11.082
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发表时间：
2012-07-01
影响因子：
4.7
通讯作者：
Kuebler, Andrea
中科院分区：
文献类型：
--
作者：
Spueler, Martin;Bensch, Michael;Kuebler, Andrea
目的：为了探讨错误相关电位是否可以用来提高P3脑机接口（BCI）在健康和运动障碍individuals.Methods的信息传输率：提取和分类的错误相关电位进行离线记录的数据从6个肌萎缩侧索硬化症（ALS）患者。一项有17名健康参与者和6名运动障碍参与者的在线研究随后进行，使用修改后的P3拼写器提供拼写字母的明确反馈。在识别错误相关的电位，界面通知用户，不正确的字母被自动删除。结果：6例ALS患者的P3拼写数据的离线交叉验证估计增加比特率0.44位/审判。在在线拼写过程中，参与者使用纠错系统（ECS）将比特率提高了0.52比特/次。一些参与者进行自由拼写，并能够提高他们的比特率。最后，我们证明，健康的参与者可以增加他们的比特率通过使用分类器预先训练其他用户的data.Conclusions：错误相关电位作为信息的第二来源，可以用来增加整体比特率在P3 BCI.Significance：该方法应提供给任何患者使用P3 BCI进行通信。(C)2011年国际临床神经生理学联合会。由爱思唯尔出版爱尔兰保留所有权利。
Objective: To investigate whether error-related potentials can be used to increase information transfer rate of a P3 brain-computer interface (BCI) in healthy and motor-impaired individuals.Methods: Extraction and classification of the error-related potential was performed offline on data recorded from six amyotrophic lateral sclerosis (ALS) patients. An online study with 17 healthy and six motor impaired participants followed, using a modified P3 speller to provide explicit feedback of spelled letters. On recognition of error-related potentials, the interface informed users that the incorrect letter was automatically deleted.Results: The offline cross-validation estimate of P3 speller data of six ALS patients increased bit rate by 0.44 bit/trial. During online copy spelling, the participants increased their bit rate by 0.52 bit/trial with the error correction system (ECS). Some participants performed free spelling and were able to increase their bit rate. Finally, we demonstrated that healthy participants could increase their bit rate by using a classifier pre-trained on other users' data.Conclusions: Error-related potentials as a secondary source of information can be used to increase overall bit rate in a P3 BCI.Significance: The method should be made available to any patient using the P3 BCI for communication. (C) 2011 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland All rights reserved.