Department of Developmental Psychology and Socialization, University of Padova, Italy.
Clin Neurophysiol. 2012 Apr;123(4):774-9. doi: 10.1016/j.clinph.2011.07.045. Epub 2011 Sep 7.
Studies on brain computer interfaces (BCIs) have been mainly concerned with algorithm improvement for better signal classification. Fewer studies, however, have addressed to date the role of cognitive mechanisms underlying the elicitation of brain-signals in BCIs. We tested the effect of visuospatial attention orienting on a P300-guided BCI, by comparing the effectiveness of three visual interfaces, which elicited different modalities of visuospatial attention orienting (exogenous vs. endogenous).
Twelve healthy participants performed 20 sessions, using the abovementioned P300-guided BCI interfaces to control a cursor. Brain waves were recorded on each trial and were subsequently classified on-line using an ad hoc algorithm. Each time the P300 was correctly classified, the cursor moved towards the target position.
The "endogenous" interface was associated with significantly higher performance than the other two interfaces during the testing sessions, but not in the follow-up sessions.
Endogenous visuospatial attention orienting can be effectively implemented to increase the performance of P300-guided BCIs.
The study of visuospatial attention underlying participants' performance is essential for implementing efficient visual BCIs.
脑机接口（BCI）的研究主要集中在改进算法以实现更好的信号分类上。然而，迄今为止，较少的研究涉及到诱发 BCI 中脑信号的认知机制的作用。我们通过比较三种诱发不同模式的外源性和内源性的视觉注意定向的视觉接口，测试了视觉空间注意定向对 P300 引导的 BCI 的影响。
12 名健康参与者进行了 20 次试验，使用上述 P300 引导的 BCI 接口来控制光标。在每次试验中记录脑波，并随后使用专门的算法进行在线分类。每次正确分类 P300 时，光标都会移动到目标位置。
“内源性”界面在测试期间与其他两个界面相比，表现显著更高，但在后续测试中则没有。
内源性视觉空间注意定向可以有效地实施，以提高 P300 引导的 BCI 的性能。
研究参与者表现背后的视觉空间注意对于实施有效的视觉 BCI 至关重要。
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