触觉、视觉和双峰p300:双峰p300能提高脑机接口性能吗?

A. Brouwer, J. V. Erp, F. Aloise, F. Cincotti
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引用次数: 26

摘要

P300是出现在目标刺激后的EEG阳性峰。对于脑机接口(bci),通过触觉刺激诱发p300将具有特定的优势;这种显示器可以藏在衣服下面,使用户的视线不受干扰。此外,稳健分类对脑机接口尤为重要。这促使我们研究p300对触觉和视觉刺激的单峰和双峰反应。触觉刺激是由参与者腰部周围的因素传递的。视觉刺激在显示器上闪现圆圈,以图式表示因素。参与者注意到在一系列标准中呈现的“目标”的振动和/或闪光。不同模态的P300振幅在大小上是相似的,并且取决于电极的位置。在双峰条件下,分类准确率最高。我们得出结论,与单峰呈现相比,双峰刺激可以增强脑机接口背景下的分类结果。
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Tactile, Visual, and Bimodal P300s: Could Bimodal P300s Boost BCI Performance?
The P300 is a positive peak in EEG occurring after presentation of a target stimulus. For brain-computer interfaces (BCIs), eliciting P300s by tactile stimuli would have specific advantages; the display can be hidden under clothes and keeps the user’s gaze free. In addition, robust classification is especially important for BCIs. This motivated us to investigate P300s in response to tactile and visual stimuli unimodally and bimodally. Tactile stimuli were delivered by tactors around the participant’s waist. Visual stimuli were flashed circles on a monitor, schematically representing the tactors. Participants attended to the vibrations and/or flashes of a “target” presented in a stream of standards. The P300 amplitude for the different modalities was comparable in size and depended on electrode location. Classification accuracy was highest in the bimodal condition. We conclude that bimodal stimuli could enhance classification results within a BCI context compared to unimodal presentations.
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