Millisecond Forums

Dear Dave,
For our experiment, we have 5 different ports. 4 with odors and 1 with air. We want the air port to be open during instructions/break pages and pretrial jittered intervals. Then, within the trial at stimulus times 0 we still want it open, then change at stimulustimes 2850 to one of the other 4 ports in a random way (solved) and then go back to air port at stimulustime 5000 till the end of the trial.
I thought about the /onexptbegin attribute, to ensure that the port will be also open during the non-trial parts, but I am not sure if this command interferes to the trial stimulustimes command.

<trial xx>
/ ontrialbegin = [trial.xx.resetstimulusframes();
         trial.xx.insertstimulustime(list.xx_odors.nextvalue, 2850);]
/ stimulustimes = [0=port.V5;** 0 = 3; 1000 = 2; 2000 = 1; 3000 = inhale; 5000 = Square; 5000 = port.V5; 7000 = list.Fear_Pictures; 7200 = Square; 7200 = Answer;]
/ pretrialpause = noreplace(1050,1550,2050,2550)
…
</trial>
<expt complete>
/onexptbegin = [port.V5]
…
<expt>
** is this necessary or it’s interpreted as a way to close the port when the same command with onexpt begin is repeated at the beginning of the trial?
Thank you in advance for your help.