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Example waveforms recorded by CRT (top) and LCD (bottom) in one subject. All LCD peak delay latencies are compared to those of CRT. Both N75 and P100 indicate sufficient reproducibility. However, the N145 reflects differences in peak latencies. Thus, average latency values are marked on the N145. Time scale (lateral axis): 30 ms/division; Amplitude scale (vertical axis): 5 μV/division; CRT: cathode ray tube; LCD: liquid crystal display; ms: millisecond
Source publication
PurposeOwing to several factors, peak latencies of pattern-reversal visual evoked potentials (p-VEP) are delayed when viewing liquid crystal display (LCD) monitors compared to those evoked when viewing cathode ray tube (CRT) monitors. However, few studies have examined whether biological factors affect latency in LCD. This study aimed to investigat...
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Citations
... However, the peak times (N75, P100 and N140) depend on the technical parameters of the stimulator (display unit) used. A number of studies describe these dependencies for different types of display units (LCD/CRT: [5][6][7]17 ; LCD: 14,24 ; OLED: 8,10 ; curved OLED: 9 ; DLP: 11 ) and different aspects of their use 6,14,16 . The results of the abovementioned studies suggest that such devices that can provide the imaged structure at once over the entire area, with high spatial and temporal homogeneity of imaging, can improve the quality of stimulation and thus the PR VEPs obtained. ...
A rapid checkerboard pattern change is used to elicit pattern-reversal visual evoked potentials (PR VEPs). CRT or LCD monitors do not allow immediate reversal of the entire pattern. The study aimed to construct a new stimulator whose characteristics approximate an instantaneous reversal and verify whether the improvement is reflected in PR VEPs. A new stimulator using a matrix of 12 × 48 independent white square LEDs was designed and compared with LCDs and CRTs. The effect on the PR VEP peak times and amplitudes of N70, P100, and P140 waves was evaluated in ten subjects. The LED stimulator showed significantly better performance in the rate of change of illuminance, change of pattern, luminance settling and stability. The PR VEP amplitudes of N75, P100, and N140 did not show significant differences. The sum of interpeak amplitudes was significantly larger for the LCD than for the other monitors. The peak times of the waves evoked by the LED were shorter than those evoked by the LCD and CRT for the N75 wave and a check size of 30´. LED stimulators are a better alternative to CRTs for PR VEPs than current LCDs. LEDs also seem to be better than CRTs, but further research is necessary to obtain significant results.
... With utmost interest, I read the article by Ura et al. [1], in which the authors compare VEP responses recorded to pattern-reversal stimuli that were presented on either a cathode-ray tube (CRT) or a liquid-crystal display (LCD) monitor. Because visual electrophysiology relies critically on precise stimulation, the topic is of great importance. ...
