I don't expect perfection, but would like feedback to help choose how to setup a new lab using E-Prime using physiological equipment in two rooms. One room has two PCs, one recording physiological measurements, connected (via the parallel port) to a second PC running E-Prime. Each will be monitored by experimenters in that room. The other room has the subject's video display and button box. My question has to do ONLY with the E-Prime PC. We want experimenters to be able to see what the subject sees, while they monitor physiological recording, so we want the E-Prime video mirrored on LCD displays in the two rooms. Of course this is a very common situation for such labs (using EEG, fMRI, EDR, etc). Our E-Prime computer has a video card (<font face="arial" size="1">AMD RADEON HD 7470)</font> with one Display Port and one VGA port. Using this computer and display card, there are 3 simple ways (afaik) to accomplish what I want and display the same thing on two monitors:<br><ol><li>Connect one LCD to the Display Port and the other to the VGA port, and set the display card to clone mode;</li><li>Connect a VGA Y-splitter to the computer's VGA port, and connect one LCD monitor to each side of the splitter; or</li><li>Connect a Display Port Y-splitter to the computer's VGA port, and connect one LCD monitor (via Display Port-to-HDMI or -to-VGA converter) to each side of the splitter.</li></ol><p>Using method #1, the E-Prime 2.0.10.184 or later Experiment Advisor will warn that "Mirroring can cause timing issues since vertical blank synchronization is not accurate between multiple displays..." (see <a href="http://www.pstnet.com/support/kb.asp?TopicID=5014">KB 5014 - FEATURE: Experiment Advisor Module - Display adapter set to clone mode</a>). However, I do not know whether using a splitter will actually improve timing consistency or solve any issues related to vertical blank synchronization. If a splitter would be better, Also, I don't know whether the type of splitter would make any difference in this regard. (I do know that video resolution and quality might differ). Note that I am aware of various issues (eg., input lag, rise time) that can compromise timing accuracy of LCD displays. As a said at the outset, I'm not expecting perfection, or even anything close to the accuracy of a single CRT monitor. My goal is simply to minimize the <u>variability</u> of the time between the onset sync, detected by E-Prime, and the onset of the visual display seen by the subject. A constant lag does not concern me. Also, the two monitors to do NOT need to be synchronized with each other, except to the extent necessary for even one to be (relatively) synchronized to the vertical blank. Also note that I am NOT concerned or asking about synchronization between physiological recordings and the vertical blank time detected by E-Prime, signaled via the parallel port; that's a different and less troublesome issue, imho. Also, I understand that timing accuracy is more or less critical, depending on experimental paradigms and physiological measures. All I'm asking about is which of the 3 methods listed above can be expected to yield the most consistent and reliable (or least bad) timings, as a general rule, when connecting two LCD displays, both showing the same content, to one PC running E-Prime. If anyone knows any better methods, other than these 3, I'd like to hear about them as well.</p><p>Thanks, in advance, for sharing relevant experience, knowledge, and advice. --Scott<br></p><p><br></p>
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