A high-ITR SSVEP-based BCI speller
A high-ITR SSVEP-based BCI speller
复制标题
基于 SSVEP 的高 ITR BCI 拼写器
DOI：
10.1080/2326263x.2014.944469
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发表时间：
2014-01-01
影响因子：
2.1
通讯作者：
Gao, Xiaorong
中科院分区：
文献类型：
--
作者：
Chen, Xiaogang;Chen, Zhikai;Gao, Xiaorong
拼写是脑机接口(BCI)的重要应用。以前的BCI拼写由于其较低的信息传输率(ITR)而不适合广泛使用。在本研究中，我们构建了一个基于稳态视觉诱发电位(SSVEP)的高ITR脑-机接口拼写器。实现了45个目标的脑机接口拼写器，频率分辨率为0.2赫兹。采样正弦刺激方法被用来在常规LCD屏幕上呈现视觉刺激。在线测试结果表明，所提出的脑-机接口拼写器在低频刺激时具有较高的平均准确率(2次S刺激时间为84.1%，3次S刺激时间为90.2%)和相应的高信噪比(2次S刺激时间为105bit/min，3次S刺激时间为82bit/min)，而高频刺激时4次S时间窗的平均准确率为88.7%和61bit/min。
Spelling is an important application of brain-computer interfaces (BCIs). Previous BCI spellers were not suited for widespread use due to their low information transfer rate (ITR). In this study, we constructed a high-ITR BCI speller based on the steady-state visual evoked potential (SSVEP). A 45-target BCI speller was implemented with a frequency resolution of 0.2 Hz. A sampled sinusoidal stimulation method was used to present visual stimuli on a conventional LCD screen. The online results revealed that the proposed BCI speller had a good performance, reaching a high average accuracy (84.1% for 2 s stimulation time; 90.2% for 3 s stimulation time) and the corresponding high ITR (105 bits/min for 2 s stimulation time, 82 bits/min for 3 s stimulation time) during the low-frequency stimuli, while 88.7% and 61 bits/min were achieved for a 4 s time window during the high-frequency stimuli.