Qiu Zhaoyang, Allison Brendan Z, Jin Jing, Zhang Yu, Wang Xingyu, Li Wei, Cichocki Andrzej
IEEE Trans Neural Syst Rehabil Eng. 2017 Jul;25(7):1009-1017. doi: 10.1109/TNSRE.2017.2655542. Epub 2017 Jan 19.
motor imagery (MI) is a mental representation of motor behavior. The MI-based brain computer interfaces (BCIs) can provide communication for the physically impaired. The performance of MI-based BCI mainly depends on the subject's ability to self-modulate electroencephalogram signals. Proper training can help naive subjects learn to modulate brain activity proficiently. However, training subjects typically involve abstract motor tasks and are time-consuming.
to improve the performance of naive subjects during motor imagery, a novel paradigm was presented that would guide naive subjects to modulate brain activity effectively. In this new paradigm, pictures of the left or right hand were used as cues for subjects to finish the motor imagery task. Fourteen healthy subjects (11 male, aged 22-25 years, and mean 23.6±1.16) participated in this study. The task was to imagine writing a Chinese character. Specifically, subjects could imagine hand movements corresponding to the sequence of writing strokes in the Chinese character. This paradigm was meant to find an effective and familiar action for most Chinese people, to provide them with a specific, extensively practiced task and help them modulate brain activity.
results showed that the writing task paradigm yielded significantly better performance than the traditional arrow paradigm (p < 0.001). Questionnaire replies indicated that most subjects thought that the new paradigm was easier.
the proposed new motor imagery paradigm could guide subjects to help them modulate brain activity effectively. Results showed that there were significant improvements using new paradigm, both in classification accuracy and usability.
运动想象（MI）是运动行为的一种心理表征。基于运动想象的脑机接口（BCI）可为身体有障碍的人提供交流方式。基于运动想象的BCI的性能主要取决于受试者自我调节脑电图信号的能力。适当的训练可以帮助新手受试者学会熟练地调节大脑活动。然而，训练受试者通常涉及抽象的运动任务，并且耗时较长。
为了提高新手受试者在运动想象过程中的表现，提出了一种新的范式，该范式将指导新手受试者有效地调节大脑活动。在这个新范式中，左手或右手的图片被用作线索，让受试者完成运动想象任务。14名健康受试者（11名男性，年龄在22 - 25岁之间，平均年龄为23.6±1.16岁）参与了这项研究。任务是想象写一个汉字。具体来说，受试者可以想象与汉字书写笔画顺序相对应的手部动作。这个范式旨在为大多数中国人找到一个有效且熟悉的动作，为他们提供一个具体的、经过大量练习的任务，并帮助他们调节大脑活动。
结果表明，书写任务范式的表现明显优于传统的箭头范式（p < 0.001）。问卷调查回复表明，大多数受试者认为新范式更容易。
所提出的新运动想象范式可以指导受试者有效地调节大脑活动。结果表明，使用新范式在分类准确率和可用性方面都有显著提高。
