<div dir="ltr">Hello,<br><br>I'm designing a task for an fMRI experiment, so I've been using cumulative timing in order to ensure the experiment kept pace with the scanner.<br><br>However, two of the stimuli are displayed for very brief periods (~70msec and ~30msec), and I found that cumulative timing altered the duration of the displays by a rather larger amount.<br><br>I've tried using event timing for just those two stimuli, and I found that they're duration is now much closer to what it should be.<br><br>Now, I'm worried if this will cause unacceptable delays in the task, and I have a few questions.<br><br><ol><li>Is it ever acceptable to combine Event and Cumulative timing in one trial? </li><li>Is the ".OnsetDelay" variable equal to the <i>total</i> amount that a stimulus is delayed? Or is it just the amount of <i>additional</i> delay?</li><li>Does an average OnsetDelay of ~50 msec seem acceptable to you all?</li><li>Does EPrime automatically correct for OnsetDelays or do I need to add a script that sums the OnsetDelays for a given trial and then subtracts that time from the ITI (or something similar)?</li></ol><p><br></p><p>Thank you,</p><p>Kyle<br></p></div>
<p></p>
-- <br />
You received this message because you are subscribed to the Google Groups "E-Prime" group.<br />
To unsubscribe from this group and stop receiving emails from it, send an email to e-prime+unsubscribe@googlegroups.com.<br />
To post to this group, send email to e-prime@googlegroups.com.<br />
To view this discussion on the web visit <a href="https://groups.google.com/d/msgid/e-prime/b5f4c4da-56dd-48fe-8080-d8941c33e592%40googlegroups.com">https://groups.google.com/d/msgid/e-prime/b5f4c4da-56dd-48fe-8080-d8941c33e592%40googlegroups.com</a>.<br />
For more options, visit <a href="https://groups.google.com/groups/opt_out">https://groups.google.com/groups/opt_out</a>.<br />