Martens S M M, Hill N J, Farquhar J, Schölkopf B
Empirical Inference Department, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.
J Neural Eng. 2009 Apr;6(2):026003. doi: 10.1088/1741-2560/6/2/026003. Epub 2009 Mar 2.
We reveal the presence of refractory and overlap effects in the event-related potentials in visual P300 speller datasets, and we show their negative impact on the performance of the system. This finding has important implications for how to encode the letters that can be selected for communication. However, we show that such effects are dependent on stimulus parameters: an alternative stimulus type based on apparent motion suffers less from the refractory effects and leads to an improved letter prediction performance.
我们揭示了视觉P300拼写器数据集中事件相关电位中存在不应期和重叠效应，并展示了它们对系统性能的负面影响。这一发现对于如何编码可供选择用于通信的字母具有重要意义。然而，我们表明这种效应取决于刺激参数：基于表观运动的替代刺激类型受不应期效应的影响较小，并能提高字母预测性能。
