[DMDX] RE:  Paul, 	How important is the ?  I would try running the file without that, just to check that this is causing the problem.  This parameter specifies the time interval between a request (pressing the spacebar) and the onset of the first frame.  Since you are preserving the fixation point from the preceding item, this hardly seems necessary. 	Also, it would be useful if you included a subject header next time, so that people can tell whether this posting is likely to be of interest. 	--k.i.f. -----Original Message----- From: DMDX-owner@psy1.psych.arizona.edu [mailto:DMDX-owner@psy1.psych.arizona.edu] On Behalf Of Paul Dockree Sent: Tuesday, March 18, 2003 12:06 PM To: DMDX@psy1.psych.arizona.edu Subject: [DMDX]  Hi, I've set up an experiment such that a fixation point will remain on screen  while numbers are sequentially presented above the fixation.  The  continuous fixation is giving me timing problems. Here's a sample of the script:                      0  "Please respond in the same way",  "as the practice run.",  "The most important thing is to",  "respond  correctly (right mouse click)",  "to the grey coloured numbers.",   "Press the SPACEBAR to start"; +1   Â+Â/! *   Âb41"/   Â+Â/!; +1   Â+Â/! *   Âb42"/   Â+Â/!; +9   Â+Â/! *   Âb43"/   Â+Â/!; +8   Â+Â/! *   Âb34"/   Â+Â/!; +1   Â+Â/! *   Âb15"/   Â+Â/!; +1   Â+Â/! *   Âb56"/   Â+Â/!; +1   Â+Â/! *   Âb27"/   Â+Â/!; +1   Â+Â/! *   Âb38"/   Â+Â/!; +1   Â+Â/! *   Âb19"/   Â+Â/!; The output gives me display errors as follows:  !  Display error at msec 25682, tick 1846 in item 1, frame "+" !  moved into video memory 1 tick  late!     (previous frame's duration will have been longer) These errors do not occur for every line but quite frequently across the task.  Any ideas on how to remedy this? Many thanks, Paul. ------------------------------------------ Paul Dockree Department of Psychology Ãras an Phiarsaigh University of Dublin Trinity College Dublin 2 Ireland Tel:  +353 (0)1 608 3083 ====================================================================    Send mail to DMDX-request@psy1.psych.arizona.edu with the word   'unsubscribe' by itself with no quotes in the body of the email   to be removed from the list.  The list archive is available here:           http://psy1.psych.arizona.edu/cgi-bin/DMDX/thread ====================================================================