The effects of stimulus timing features on P300 speller performance.
The effects of stimulus timing features on P300 speller performance.
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DOI：
10.1016/j.clinph.2012.08.002
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发表时间：
2013-02
期刊：
影响因子：
--
通讯作者：
Pouratian N
中科院分区：
文献类型：
--
作者：
Lu J;Speier W;Hu X;Pouratian N
尽管许多影响P300拼写性能的因素的检查，刺激呈现参数的影响仍然不完全清楚。本研究探讨了四个不同的刺激呈现参数（刺激关闭时间[ISI*]，刺激间隔[ISI]，闪光持续时间，闪光持续时间：ISI比）的P300拼写的准确性和效率的影响。从一个32电极集的EEG数据记录从六个主题使用的行-列范式的拼写任务和离线分析。P300拼写者的准确性受到重复试验次数的影响（F（14，354）= 69.002，p<0.0001），正如预期。此外，较长的ISI和ISI* 时间导致更高的准确性和每分钟字符数[CPM]率。对整个组的子集（即表现良好与表现不佳）进行比较，以显示表现趋势的一致性，尽管受试者之间存在很大差异。此外，无论是使用整个32电极数据集还是Sharborough等人描述的减少的8通道集，1991.尽管用户表现的变化，ISI* 和ISI都可以影响P300拼写性能。P300系统优化必须考虑关键的刺激定时功能，包括ISI* 和ISI。这些定时功能的影响，在网上实验的进一步表征是必要的，准确性和CPM的差异效应应更全面地探讨。
Despite numerous examinations of factors affecting P300 speller performance, the impact of stimulus presentation parameters remains incompletely understood. This study examines the effects of four distinct stimulus presentation parameters (stimulus-off time [ISI*], interstimulus interval [ISI], flash duration, and flash-duration: ISI ratio) on the accuracy and efficiency of the P300 speller performance. EEG data from a 32-electrode set were recorded from six subjects using a row-column paradigm of the speller task and analyzed offline. P300 speller accuracy is affected by the number of trial repetitions (F(14,354)= 69.002, p<0.0001), as expected. In addition, longer ISI and ISI* times resulted in higher accuracy and characters per minute [CPM] rates. Subsets of the entire group (i.e. good vs. poor performers) were compared to show consistency of performance trends despite great variance among subjects. Moreover, the same significant effects were observed whether using the entire 32-electrode dataset or the reduced 8-channel set described by Sharborough et al., 1991. Despite variability in user performance, both ISI* and ISI can affect P300 speller performance. P300 system optimization must consider critical stimulus timing features including ISI* and ISI. Further characterization of the impact of these timing features in online experiments is warranted and the differential effect on accuracy and CPM should be more comprehensively explored.
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影响因子：
4
作者：
Speier W;Arnold C;Lu J;Taira RK;Pouratian N
通讯作者：
Pouratian N
影响因子：
4
作者：
Citi, Luca;Poli, Riccardo;Cinel, Caterina
通讯作者：
Cinel, Caterina
影响因子：
4.6
作者：
Schalk, G;McFarland, DJ;Wolpaw, JR
通讯作者：
Wolpaw, JR
DOI：
10.1016/j.clinph.2010.01.030
发表时间：
2010-07
期刊：
Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology
影响因子：
--
作者：
Townsend G;LaPallo BK;Boulay CB;Krusienski DJ;Frye GE;Hauser CK;Schwartz NE;Vaughan TM;Wolpaw JR;Sellers EW
通讯作者：
Sellers EW
DOI：
10.1109/tnsre.2004.841878
发表时间：
2005-03-01
影响因子：
4.9
作者：
Serby, H;Yom-Tov, E;Inbar, GF
通讯作者：
Inbar, GF