Brain-computer predictability of brain-computer communication
Brain-computer predictability of brain-computer communication
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DOI：
10.1027/0269-8803.18.23.121
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发表时间：
2004-01-01
影响因子：
1.3
通讯作者：
Birbaumer, N
中科院分区：
文献类型：
--
作者：
Kübler, A;Neumann, N;Birbaumer, N
自1996年以来，我们一直在教导超过18名严重或完全瘫痪的患者通过系统地改变其慢皮层电位的幅度来成功地控制计算机屏幕上光标的移动（SCP; Birbaumer，Ghanayim，Hinterberger，Iversen，Kotchoubey等人，1999年）。患者通过脑-机接口（130）和关于SCP振幅偏移的时间过程的在线反馈（由计算机屏幕上的光标移动表示）来学习对他们的SCP振幅的调节。当患者能够成功地调节他们的SCP振幅时，他们通过语言支持程序被训练使用这种能力与朋友和照顾者进行交流（Perelmouter，Kotchoubey，Kubler，Taub，& Birbaumer，1999年）具有训练进展的可靠预测器将是特别有帮助的，因为在家中训练患者需要大量的努力，并且鉴于有限的人力和财力。在这项研究中，我们提供了来自健康参与者（n = 10）和患者样本（n = 10）的数据，诊断为肌萎缩侧索硬化症，他们参加了6次BCI训练课程; 6名患者继续训练另外6次。除一名参与者外，所有参与者都实现了稳定的显著光标控制。实现显著光标控制（初始训练阶段）所需的会话数量与实现70%的正确响应率（高级训练阶段）所需的会话数量中度相关。在六次训练中，表现的个体差异保持稳定。经过六次训练后，两组都取得了显著的光标控制，但患者的表现比健康参与者差。然而，患者每周只接受一次训练，有些患者的训练中断时间更长。我们的结论是，在初始培训阶段的学习表明，培训的持续时间，将是必要的，以实现70%的正确反应。为了取得更快的进步，每周更频繁的培训似乎是必要的。
Since 1996 we have been teaching more than 18 severely or totally paralyzed patients to successfully control the movements of a cursor on a computer screen by means of systematic changes in the amplitudes of their slow cortical potentials (SCPs; Birbaumer, Ghanayim, Hinterberger, Iversen, Kotchoubey et al., 1999). Patients learned regulation of their SCP amplitudes by means of a brain-computer interface (130) and on-line feedback about the time course of SCP amplitude shifts, represented by cursor movements on a computer screen. When patients were able to successfully regulate their SCP amplitude, they were trained to use this ability to communicate with friends and caregivers by means of a Language Support Program (Perelmouter, Kotchoubey, Kubler, Taub, & Birbaumer, 1999).Having a reliable predictor of progress in training would be particularly helpful because training patients at their homes requires substantial effort and a positive outcome is desirable given limited personal and financial resources. In this study we present data from healthy participants (n = 10) and a sample of patients (n = 10), diagnosed with amyotrophic lateral sclerosis, who participated in six BCI training sessions; six patients continued training for another six sessions. All participants except one achieved stable significant cursor control. The number of sessions needed to achieve significant cursor control (initial training phase) correlated moderately with the number of sessions needed to achieve a correct response rate of 70% (advanced training phase). Individual differences in performance remained stable within the six training sessions. After six sessions both groups had achieved significant cursor control, but patients' performance was poorer than that of healthy participants. The patients, however, were trained once a week only, and for some patients longer breaks in training occurred. We conclude that learning during the initial training phase indicates the duration of training that will be necessary to achieve 70% correct responses. A higher frequency of training sessions per week seems necessary to achieve faster progress.