[DMDX] CR timing intelligence check I realize that  timing issues are documented, but nevertheless I find myself with a nagging sense of insecurity that I am understanding them correctly. Could someone please check my understanding of the timing of the following item in a DMDX item file (which I have broken up here into "lines" and simplified): ### Psuedo Item file snipplet ###           [line 1]  +23   "+"  / [line 2]     "+" ,  "O" *   / [line 3]    "+" / [line 4]  , "+" , ">>>>>" ; Intentions: Display a "+" for 223 ticks [line 1] Display a "+" and superimposed "O" for 13 tics, start RT timer at beginning of frame [line 2] Display a "+" for 13 ticks [line 3] Display a "+" and ">>>>>" for 106 ticks.  Advance to next frame (item) on RT response or timeout elapsed     frame             event ticks       duration ------------------------------------------------------- 1           223               display line 1 224         1                 change frame 225         13                begin line 2, start timer 238         1                 change frame 239         49                display line 3 288         1                 change frame 289         13                display line 4 Thank you, Derek Note:  The strange construction of:      "+" ,  "O"  from line 2 was discussed in the archives several years ago (psy1.psych.arizona.edu/cgi-bin/thread?message=660756). I don't remember why I found it necessary to do it that way, but it seemed necessary! ### actual item file snip ###             1000     "+"    /; -1      "+"  /      "+" ,     "O" *   /     "+" /    "+" ,     ">><>>" ; --  Derek N. Eder SU/Sahlgrenska Utvecklingslab 1, Med GrÃ¶na strÃ¥ket 8 SE 413 45 GÃ¶teborg (Gothenburg) Sverige (Sweden) +46 (031)* 342 8261 (28261 inom Sahlgrenska) +46 0709 721 283 (mobile) +46 (031) 25 97 07 (home) * omit the 0 when calling from outside Sweden personal web page:  derek-eder.org