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arXiv 1810.03428cs.HCq-bio.NC
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使用单词预测的零校准cVEP BCI:概念验证

Zero-calibration cVEP BCI using word prediction: a proof of concept

Federica Turi, Nathalie Gayraud, Maureen Clerc

摘要:

基于视觉诱发电位(VEP)的脑机接口(BCI)允许从闪烁字符的键盘进行拼写。在VEP BCI中,编码调制视觉诱发电位(c-VEP)被设计用于高速通信。在c-VEP中,所有字符同时闪烁。特别是,每个字符根据预定义的63位二进制序列(m序列)闪烁,循环移位不同的时间滞后。对于给定的字符,m序列在受试者的脑电图(EEG)中唤起VEP,其可以用作模板。该模板在每次会话开始时的校准阶段期间获得。然后,系统通过估计其相对于模板的时间滞后,在预定义的重复次数之后输出期望的字符。我们的工作避免了校准阶段,从视觉诱发电位提取连续字符之间的相对滞后,并使用字典预测完整的单词。

英文摘要:

Brain Computer Interfaces (BCIs) based on visual evoked potentials (VEP) allow for spelling from a keyboard of flashing characters. Among VEP BCIs, code-modulated visual evoked potentials (c-VEPs) are designed for high-speed communication . In c-VEPs, all characters flash simultaneously. In particular, each character flashes according to a predefined 63-bit binary sequence (m-sequence), circular-shifted by a different time lag. For a given character, the m-sequence evokes a VEP in the electroencephalogram (EEG) of the subject, which can be used as a template. This template is obtained during a calibration phase at the beginning of each session. Then, the system outputs the desired character after a predefined number of repetitions by estimating its time lag with respect to the template. Our work avoids the calibration phase, by extracting from the VEP relative lags between successive characters, and predicting the full word using a dictionary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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