Matsumoto Celso Soiti, Shinoda Kei, Matsumoto Harue, Funada Hideaki, Sasaki Kakeru, Minoda Haruka, Mizota Atsushi
Department of Ophthalmology, Teikyo University School of Medicine, Tokyo.
Ophthalmic Res. 2014;51(3):117-23. doi: 10.1159/000356688. Epub 2014 Jan 7.
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).
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.
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.
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.
评估具有更高驱动频率和更短响应时间（2毫秒）的液晶显示器（LCD）作为视觉刺激器诱发图形翻转视觉诱发电位（p-VEP）的效用。
从12名健康志愿者（28.3±9岁）的12只眼睛记录p-VEP。将传统阴极射线管（CRT）屏幕诱发的p-VEP与高速LCD屏幕（2毫秒LCD，GD245HQbid，宏碁，台湾台北）诱发的p-VEP进行比较。用光电二极管测量每个显示器的亮度变化。
在翻转阶段，对比度为97%的2毫秒LCD屏幕的亮度会短暂降低，这会诱发视网膜电图（ERG），进而诱发闪光VEP。对比度为81%的棋盘格2毫秒LCD在翻转阶段亮度降低最小，因此未诱发ERG。在以CRT或2毫秒LCD屏幕作为刺激器诱发的p-VEP中，未观察到P100波幅以及N75和P100潜伏期的显著差异。
亮度变化会诱发闪光VEP，通过使用对比度降低的棋盘格刺激的2毫秒LCD屏幕可将这种伪迹最小化。
