The traditional P300 speller system uses the flashing row or column spelling paradigm. However, the classification accuracy and information transfer rate of the P300 speller are not adequate for real-world application. To improve the performance of the P300 speller, we devised a new spelling paradigm in which the flashing row or column of a virtual character matrix is covered by a translucent green circle with a red dot in either the upper or lower half (GC-RD spelling paradigm). We compared the event-related potential (ERP) waveforms with a control paradigm (GC spelling paradigm), in which the flashing row or column of a virtual character matrix was covered by a translucent green circle only. Our experimental results showed that the amplitude of P3a at the parietal area and P3b at the frontal–central–parietal areas evoked by the GC-RD paradigm were significantly greater than those induced by the GC paradigm. Higher classification accuracy and information transmission rates were also obtained in the GC-RD system. Our results indicated that the added red dots increased attention and visuospatial information, resulting in an amplitude increase in both P3a and P3b, thereby improving the performance of the P300 speller system.

中文翻译：

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添加红点的拼写范式提高了 P300 拼写系统的性能

传统的 P300 拼写系统使用闪烁的行或列拼写范例。但是，P300 拼写器的分类准确率和信息传输率不足以满足实际应用。为了提高 P300 拼写器的性能，我们设计了一种新的拼写范式，其中虚拟字符矩阵的闪烁行或列被半透明的绿色圆圈覆盖，上半部分或下半部分带有红点（GC-RD 拼写）范例）。我们将事件相关电位 (ERP) 波形与控制范式（GC 拼写范式）进行了比较，其中虚拟字符矩阵的闪烁行或列仅被半透明的绿色圆圈覆盖。我们的实验结果表明，GC-RD 范式诱发的顶叶区 P3a 和额叶中央顶叶区 P3b 的振幅显着大于 GC 范式诱发的振幅。GC-RD 系统也获得了更高的分类精度和信息传输率。我们的结果表明，添加的红点增加了注意力和视觉空间信息，导致 P3a 和 P3b 的幅度增加，从而提高了 P300 拼写系统的性能。