Comparisons of Pattern Visually Evoked Potentials Elicited by Different Response Time Liquid Crystal Display Screens
Comparisons of Pattern Visually Evoked Potentials Elicited by Different Response Time Liquid Crystal Display Screens
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DOI：
10.1159/000356688
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发表时间：
2014-01-01
影响因子：
2.1
通讯作者：
Mizota, Atsushi
中科院分区：
文献类型：
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作者：
Matsumoto, Celso Soiti;Shinoda, Kei;Mizota, Atsushi
目的：评价高驱动频率、短响应时间（2 ms）的液晶显示器（LCD）作为视觉刺激器诱发模式反转视觉诱发电位（p-VEPs）的有效性。方法：记录12名健康志愿者（28.3±9岁）12只眼的p- vep。比较了传统阴极射线管（CRT）屏幕和高速LCD屏幕（2ms LCD, GD245HQbid, Acer, Taipei, Taiwan）所激发的p-VEPs。用光电二极管测量每个监视器的亮度变化。结果：在反转阶段，对比度为97%的2 ms LCD屏幕亮度瞬间降低，可引发视网膜电图（ERG），从而引发闪光VEP。对比度为81%的2 ms液晶屏在反转阶段有最小的亮度降低，因此没有引起ERGs。在CRT和2 ms液晶屏刺激下的p- vep中，P100的振幅和N75和P100的隐式时间无显著差异。结论：亮度变化可引起闪烁vep，采用降低棋盘刺激对比度的2 ms LCD屏幕可最大限度地减少这种伪影。(C) 2014 S. Karger AG，巴塞尔
Purpose: To evaluate the usefulness of a liquid crystal display (LCD) with higher driving frequency and shorter response time (2 ms) as a visual stimulator to elicit pattern reversal visually evoked potentials (p-VEPs). Method: p-VEPs were recorded from 12 eyes of 12 healthy volunteers (28.3 +/- 9 years). The p-VEPs elicited by a conventional cathode ray tube (CRT) screen were compared to those elicited by a high-speed LCD screen (2-ms LCD, GD245HQbid, Acer, Taipei, Taiwan). The luminance changes of each monitor were measured with a photodiode. Results: During the reversal phase the luminance of the 2-ms LCD screen with 97% contrast was transiently reduced, which can elicit an electroretinogram (ERG) and therefore a flash VEP. The 2-ms LCD with 81% contrast checkerboard had a minimal luminance reduction during the reversal phase, and therefore no ERGs were elicited. No significant differences in the amplitude of P100 and the implicit times of N75 and P100 were observed in the p-VEPs elicited by a CRT or the 2-ms LCD screens as stimulators. Conclusion: The luminance change can elicit flash VEPs, and this artifact can be minimized by using a 2-ms LCD screen with reduced contrast of the checkerboard stimulus. (C) 2014 S. Karger AG, Basel