Hi David,<br><br><font size="2">Actually, I submitted this basic question to E-Prime support a couple of hours after I posted here. Unfortunately, the body of my support request did not get submitted; don't know why but guess I goofed somehow. <font size="2">Even w</font>ithout the detailed explanation I posted here, I did get a decent response to only the title of my support request (nothing else got submitted): <span style="color: rgb(153, 153, 204); font-weight: bold;"> "What's better: mirror mode or splitter?</span>"</font><br><font size="-1">Reply:</font><br><blockquote style="margin: 0px 0px 0px 6.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;" class="gmail_quote"><font size="-1">Cloning or mirroring can cause timing issues since
vertical blank synchronization is not accurate between multiple
displays. Determining which display is considered primary can cause
confusion and may not be consistent between computer configurations.
Instead of cloning the display through software, it is better to split
it physically using a VGA splitter cable. If it is necessary for you to
view the experiment on multiple screens, you should use a splitter to
direct the output.</font><br><br><font size="-1">I hope this helps. Please let me know if you have any other questions.</font><br><br><font size="-1">Sincerely,</font><br><font size="-1">David Nicholson</font><font size="-1"><font size="-1">, </font>Technical Consultant</font><br></blockquote>I've asked for clarification and amended my request as follows:<br><blockquote style="margin: 0px 0px 0px 6.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;" class="gmail_quote"><font size="-1">Thanks. You more or less answered my question from the
support title, even though (for reasons I don't understand) the actual
text of the question was not submitted.</font><br><br><font size="-1">I'd like a little
clarification and an answer to another part of my question (which did
not get posted). You are saying if I use a splitter, then E-Prime will
see only one monitor (connected to the display card) and thus only one
vertical blank signal; is that correct? Part of my question that wasn't
posted was that I will be using two LCD monitors. Considering this,
will it make any difference whether I divide the analog signal from my
display card, using a VGA splitter or the digital signal, using a DVI or
Display Port splitter? A digital connection can transmit additional
information about the display; I wonder if this might cause any
synchronization problems. On the other hand, the VGA signal will have to
be converted to digital data by the LCD display, possibly increasing
the lag. -- Thanks for clarification & recommendations regarding the
preferred type of splitter.</font><br></blockquote><div>I'll post this support response whenever I get it. <br><br>Thanks.<br><br>Scott<br> <br></div>On Monday, December 10, 2012 12:49:02 PM UTC-6, McFarlane, David wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">Scott,
<br>
<br>Good questions, wish I had an answer, hope someone else does. You
<br>should submit this to PST Web Support at
<br><a href="http://support.pstnet.com/e%2Dprime/support/login.asp" target="_blank">http://support.pstnet.com/e%<wbr>2Dprime/support/login.asp</a> , after all it
<br>is their business to know these things. Then please post back here
<br>with the answer.
<br>
<br>Thanks,
<br>-- David McFarlane
<br>
<br>
<br>At 12/9/2012 05:08 PM Sunday, Scott wrote:
<br>>I don't expect perfection, but would like feedback to help choose
<br>>how to setup a new lab using E-Prime using physiological equipment
<br>>in two rooms. One room has two PCs, one recording physiological
<br>>measurements, connected (via the parallel port) to a second PC
<br>>running E-Prime. Each will be monitored by experimenters in that
<br>>room. The other room has the subject's video display and button box.
<br>>My question has to do ONLY with the E-Prime PC. We want
<br>>experimenters to be able to see what the subject sees, while they
<br>>monitor physiological recording, so we want the E-Prime video
<br>>mirrored on LCD displays in the two rooms. Of course this is a very
<br>>common situation for such labs (using EEG, fMRI, EDR, etc). Our
<br>>E-Prime computer has a video card (AMD RADEON HD 7470) with one
<br>>Display Port and one VGA port. Using this computer and display card,
<br>>there are 3 simple ways (afaik) to accomplish what I want and
<br>>display the same thing on two monitors:
<br>> * Connect one LCD to the Display Port and the other to the VGA
<br>> port, and set the display card to clone mode;
<br>> * Connect a VGA Y-splitter to the computer's VGA port, and
<br>> connect one LCD monitor to each side of the splitter; or
<br>> * Connect a Display Port Y-splitter to the computer's VGA port,
<br>> and connect one LCD monitor (via Display Port-to-HDMI or -to-VGA
<br>> converter) to each side of the splitter.
<br>>
<br>>Using method #1, the E-Prime 2.0.10.184 or later Experiment Advisor
<br>>will warn that "Mirroring can cause timing issues since vertical
<br>>blank synchronization is not accurate between multiple displays..."
<br>>(see <<a href="http://www.pstnet.com/support/kb.asp?TopicID=5014" target="_blank">http://www.pstnet.com/<wbr>support/kb.asp?TopicID=5014</a>>KB 5014 -
<br>>FEATURE: Experiment Advisor Module - Display adapter set to clone
<br>>mode). However, I do not know whether using a splitter will actually
<br>>improve timing consistency or solve any issues related to vertical
<br>>blank synchronization. If a splitter would be better, Also, I don't
<br>>know whether the type of splitter would make any difference in this
<br>>regard. (I do know that video resolution and quality might differ).
<br>>Note that I am aware of various issues (eg., input lag, rise time)
<br>>that can compromise timing accuracy of LCD displays. As a said at
<br>>the outset, I'm not expecting perfection, or even anything close to
<br>>the accuracy of a single CRT monitor. My goal is simply to minimize
<br>>the variability of the time between the onset sync, detected by
<br>>E-Prime, and the onset of the visual display seen by the subject. A
<br>>constant lag does not concern me. Also, the two monitors to do NOT
<br>>need to be synchronized with each other, except to the extent
<br>>necessary for even one to be (relatively) synchronized to the
<br>>vertical blank. Also note that I am NOT concerned or asking about
<br>>synchronization between physiological recordings and the vertical
<br>>blank time detected by E-Prime, signaled via the parallel port;
<br>>that's a different and less troublesome issue, imho. Also, I
<br>>understand that timing accuracy is more or less critical, depending
<br>>on experimental paradigms and physiological measures. All I'm asking
<br>>about is which of the 3 methods listed above can be expected to
<br>>yield the most consistent and reliable (or least bad) timings, as a
<br>>general rule, when connecting two LCD displays, both showing the
<br>>same content, to one PC running E-Prime. If anyone knows any better
<br>>methods, other than these 3, I'd like to hear about them as well.
<br>>
<br>>Thanks, in advance, for sharing relevant experience, knowledge, and
<br>>advice. --Scott
<br>
<br></blockquote>
<p></p>
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