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Suggest consideration of added language along the lines below:

Note: It has become evident during 2009 that the phasing out of CRT (cathode-ray tube) display technology in favor of flat screen displays (such as LCD and Plasma screens) may pose new problems in the calibration of VEPstimuli. Specifically,

(1) these display technologies may frequently introduce additional delays between the electrical control signal (such as VGA computer output) and the consequent changes in the screen light output, as compared with traditional CRT displays. Spurious delays of 15-20 msec have been reported.

(2) Flat-screen technologies may introduce asymmetries between light-on and light-off events in the time-course of the light output, possibly causing transient fluctuations in overal screen luminance with each pattern reversal.

Users are cautioned against casual substitution of dispaly devices, particularly against the casual subsitution of a flat-panel display for a traditional CRT display.

Users are encouraged to communicate with equipment manufacturers to address this problem and verify steps which have been taken to ensure test results comparable to those traditionally obtained with CRT display devices.

-- ScottBrodie - 13 Jul 2009