Departamento de Tecnología Electrónica, Universidad de Málaga, 35 Louis Pasteur Boulevard, 29071, Malaga, Spain.
Med Biol Eng Comput. 2021 Apr;59(4):869-881. doi: 10.1007/s11517-021-02340-y. Epub 2021 Mar 20.
Previous proposals for controlling a P300-based BCI speller have shown an improvement using alternative images instead of letters as target stimuli under a row-column paradigm (RCP). However, the RCP is not suitable for those patients with a lack of gaze control. To solve that, the rapid serial visual presentation (RSVP) paradigm has been proposed in previous studies. The aim of the present work is to assess if a set of alternative pictures that improved performance in RCP could also improve performance in RSVP. Sixteen participants controlled four conditions in calibration and online tasks: letters in RCP, pictures in RCP, letters in RSVP and pictures in RSVP. The effect given by pictures was greater under RCP than under RSVP, both for performance and event-related potential analyses. Indeed, pictures did not show any improvement under RSVP in comparison to letters. In addition, the condition with pictures under RCP was declared the favourite by most users (68.75%), while the condition with pictures under RSVP was not chosen as favourite by any participant. Therefore, this work shows that the improvement related to the use of pictures as alternative flashing stimuli under RCP may not be transferred to RSVP. Graphical abstract.
先前有研究提出，使用行-列范式（RCP）中的替代图像而非字母作为目标刺激物，可改善基于 P300 的脑机接口拼写器的控制效果。然而，RCP 并不适用于那些缺乏注视控制能力的患者。为了解决这个问题，先前的研究中提出了快速序列视觉呈现（RSVP）范式。本研究旨在评估一套在 RCP 中提高性能的替代图片是否也能提高 RSVP 中的性能。16 名参与者在校准和在线任务中控制了四种条件：RCP 中的字母、RCP 中的图片、RSVP 中的字母和 RSVP 中的图片。与 RSVP 相比，图片在 RCP 下的效果更大，无论是在性能还是事件相关电位分析方面。实际上，与字母相比，图片在 RSVP 下并没有显示出任何改善。此外，大多数用户（68.75%）更喜欢 RCP 下的图片条件，而没有任何参与者选择 RSVP 下的图片条件。因此，这项工作表明，在 RCP 下使用替代闪烁刺激的图片改善可能无法转移到 RSVP 中。
