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A P300-based brain-computer interface (BCI): Effects of luminosity contrast, stimulus duration, interface type & screen size.

机译：基于P300的脑机接口（BCI）：亮度对比，刺激持续时间，接口类型和屏幕尺寸的影响。

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摘要

Brain-computer interface (BCI) is a new technology with the capability of allowing people with motor disabilities to live a better life. Though research has been conducted with non-disabled people, little to no research has been conducted regarding BCI usability with people with motor disabilities. This research focused on the usability analysis of P300-based BCI applications with four independent variables: luminosity contrast, stimulus duration, interface type, and screen size. Ten participants with motor disabilities and ten non-disabled participants were employed in the research. The difference in task performance between participants with and without motor disabilities was also analyzed. P300 Speller was used as the test bed in the research.;The results showed significant effect or interaction effect on task performance for most independent variables, indicating that these variables are important to consider when developing and testing P300-based BCI applications.;In study 1, participants reached an average accuracy of 51.7%. Results indicated that luminosity contrast and stimulus duration had significant effects on task performance. Participants had better task performance in high luminosity contrast than low luminosity contrast. Non-disabled participants showed significantly better task performance than participants with motor disabilities. However, stimulus duration showed different effect on different group of participants.;In study 2, participants reached an average accuracy of 54.2%. Results indicated that interface type and screen size had significant effects on task performance. Non-disabled participants showed significantly better task performance than participants with motor disabilities. However, interface type and screen size showed different effect on different group of participants.;Research showed satisfactory spelling accuracy for non-disabled participants: 76.5% in study 1 and 79.7% in study 2. However, participants with motor disabilities showed unsatisfactory spelling accuracy: 26.8% in study 1 and 28.7% in study 2. Therefore, two groups of participants demonstrated significantly different task performance, indicating that non-disabled people may not be considered as a substitute for people with motor disabilities in the BCI research.;This research found that participants with motor disabilities had better performance in frequency-based interface with higher luminosity contrast, middle stimulus duration, and bigger screen size. Because participants in this study showed different use preferences in stimulus duration and screen size, optimal use condition should be provided to the users for better task performance. This research intends to provide invaluable empirical data and meaningful insights to the future research of P300- based BCI applications.
机译：脑机接口（BCI）是一项新技术，能够使行动不便的人过上更好的生活。尽管已经对非残疾人进行了研究，但很少或根本没有关于BCI在行动障碍者中的可用性的研究。这项研究的重点是基于P300的BCI应用程序的可用性分析，该应用程序具有四个独立变量：亮度对比，刺激持续时间，界面类型和屏幕尺寸。这项研究雇用了十名运动障碍参与者和十名非残疾参与者。还分析了运动障碍者和没有运动障碍者之间的任务表现差异。 P300 Speller被用作研究的试验床。;结果表明，大多数独立变量对任务性能具有显着影响或交互作用，表明在开发和测试基于P300的BCI应用程序时，这些变量很重要。 1，参加者的平均准确率达到51.7％。结果表明，光度对比和刺激持续时间对任务绩效有显着影响。与高亮度对比相比，参与者在高亮度对比下具有更好的任务表现。非残疾参与者表现出比运动障碍者明显更好的任务表现。然而，刺激持续时间对不同的参与者群体表现出不同的影响。在研究2中，参与者的平均准确率达到54.2％。结果表明界面类型和屏幕尺寸对任务性能有显着影响。非残疾参与者表现出比运动障碍者明显更好的任务表现。但是，界面类型和屏幕尺寸对不同的参与者组显示出不同的影响。；研究显示，非残障参与者的拼写准确性令人满意：研究1和研究2分别为76.5％和79.7％。但是，运动障碍参与者的拼写准确性并不令人满意：在研究1中为26.8％，在研究2中为28.7％。因此，两组参与者表现出显着不同的任务表现，这表明在BCI研究中，非残障人士可能不被认为可以替代运动障碍人士。研究发现，行动不便的参与者在基于频率的界面中表现更好，具有更高的亮度对比，中等的刺激时间和更大的屏幕尺寸。由于该研究的参与者在刺激持续时间和屏幕尺寸方面显示出不同的使用偏好，因此应向用户提供最佳使用条件，以实现更好的任务性能。这项研究旨在为基于P300的BCI应用程序的未来研究提供宝贵的经验数据和有意义的见解。

著录项

  • 作者

    Li, Yueqing.;

  • 作者单位

    University of Arkansas.;

  • 授予单位 University of Arkansas.;
  • 学科 Engineering Biomedical.;Engineering Electronics and Electrical.
  • 学位 M.S.I.E.
  • 年度 2009
  • 页码 137 p.
  • 总页数 137
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物医学工程;无线电电子学、电信技术;
  • 关键词

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