Motivation modulates the P300 amplitude during brain-computer interface use
Motivation modulates the P300 amplitude during brain-computer interface use
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DOI：
10.1016/j.clinph.2010.01.034
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发表时间：
2010-07-01
影响因子：
4.7
通讯作者：
Kuebler, A.
中科院分区：
文献类型：
--
作者：
Kleih, S. C.;Nijboer, F.;Kuebler, A.
目的：本研究探讨了动机作为可能的心理影响变量对由事件相关电位 (ERP) 控制的脑机接口 (BCI) 中 P300 振幅和性能的影响。方法：指导参与者通过关注随机闪烁的 7 * 7 矩阵的单元来复制拼写句子。动机是通过金钱奖励来操纵的。在两个实验组中，参与者为每个正确选择的角色获得 25 (N = 11) 或 50 (N = 11) 欧分；对照组（N=11）没有得到奖励。 BCI 表现定义为正确选择的字符的总体百分比（正确响应率 = CRR）。结果：参与者的平均表现为 99%。在电极位置 Cz 处，P300 幅度与自评动机呈正相关。最积极的参与者的 P300 幅度显着高于最不积极的参与者。积极性较高的参与者能够比积极性较低的参与者更快地与 ERP-BCI 进行正确沟通。结论：动机调节 ERP-BCI 中的 P300 振幅。意义：动机可能会导致 BCI 性能的差异，应在 BCI 设置中进行监测。 (C) 2010 年国际临床神经生理学联合会。由爱思唯尔爱尔兰有限公司出版。保留所有权利。
Objective: This study examined the effect of motivation as a possible psychological influencing variable on P300 amplitude and performance in a brain-computer interface (BCI) controlled by event-related potentials (ERP).Methods: Participants were instructed to copy spell a sentence by attending to cells of a randomly flashing 7 * 7 matrix. Motivation was manipulated by monetary reward. In two experimental groups participants received 25 (N = 11) or 50 (N = 11) Euro cent for each correctly selected character; the control group (N = 11) was not rewarded. BCI performance was defined as the overall percentage of correctly selected characters (correct response rate = CRR).Results: Participants performed at an average of 99%. At electrode location Cz the P300 amplitude was positively correlated to self-rated motivation. The P300 amplitude of the most motivated participants was significantly higher than that of the least motivated participants. Highly motivated participants were able to communicate correctly faster with the ERP-BCI than less motivated participants.Conclusions: Motivation modulates the P300 amplitude in an ERP-BCI.Significance: Motivation may contribute to variance in BCI performance and should be monitored in BCI settings. (C) 2010 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.