J Neural Eng. 2019 Sep 11;16(5):056024. doi: 10.1088/1741-2552/ab386d.
Previous works have reported that complex emotional and visual stimuli can increase the amplitude of the P300 brain potential. Thus, the aim of the present work is to assess these kinds of images in a P300 brain-computer interface (BCI) speller as flashing stimuli.
Twenty-three volunteers controlled four spellers with different sets of flashing stimuli: flashing letters, neutral pictures (NP), emotional pleasant pictures (EPP) and emotional unpleasant pictures (EUP).
The sets of pictures showed a higher performance than the letters in accuracy and information transfer rate. These results were supported by the analysis of the P300 signal, where the picture sets offered the greatest amplitudes. The NP and EPP sets were the best evaluated in the subjective questionnaire.
In short, despite the fact that the effect of emotional stimuli could not be observed in the performance metrics, picture sets have offered a high performance and should be considered in future proposals for visual P300-based BCI applications.
先前的研究报告表明，复杂的情感和视觉刺激可以增加 P300 脑电位的幅度。因此，本研究旨在评估这些图像作为闪烁刺激在 P300 脑机接口（BCI）拼写器中的应用。
23 名志愿者使用不同的闪烁刺激集控制了四个拼写器：闪烁字母、中性图片（NP）、情感愉悦图片（EPP）和情感不愉快图片（EUP）。
与字母相比，图片集在准确性和信息传输率方面表现出更高的性能。这些结果得到了 P300 信号分析的支持，其中图片集提供了最大的幅度。NP 和 EPP 集在主观问卷中得到了最好的评价。
简而言之，尽管在性能指标中无法观察到情感刺激的影响，但图片集提供了较高的性能，应该在未来基于 P300 的视觉 BCI 应用的建议中考虑使用。
