Lag to play video when repeating a trial

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Lag to play video when repeating a trial

Lag to play video when repeating a trial

Author	Message
Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	Great -- thanks for taking the time to update the thread!
	Reply Like 33
sdeanda	sdeanda posted 9 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 31	Sorry for the delayed response. I finally got a chance to go back and look at this. You were right about "stimulusframes" and "stimulustimes"! That fixed it. Thanks for the help!
	Reply Like 55
Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	They behave absolutely identically -- or rather as expected -- for me (using arbitrary files I have plugged in, I don't have the ones you're using obviously). What do the relevant stimulusonset columns in your data file report as onsets for the two different trials? Edited 9 Years Ago by Dave
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sdeanda	sdeanda posted 9 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 31	That makes sense. But why would the prime trial run fine but not repeatprime?
	Reply Like 68
Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	/stimulusframes= [1 = soundWAVfile; 500 = video] You're a using stimulusframes here, not stimulustimes. I.e., you aren't displaying the video at 500 ms into the trial, but at 500 frames. Depending on your display's refresh rate, a single frame lasts between 10-20ms, i.e. the video is displayed somewhere between 5 to 10 seconds into the trial.
	Reply Like 64
sdeanda	sdeanda posted 9 Years Ago HOT Topic Details Share Topic
Group: Forum Members Posts: 9, Visits: 31	I've run into a strange issue when repeating trials. I've copied my code below. I have two trials that run back-to-back (the prime trial and target trial, see below). I was successful in repeating these pairs of trials using keyboard input. However, when I incorporate a video that plays 500 ms into one of the trials, the repeated trial lags a significant amount of time (on the order of seconds) to play the video. Note that this only happens when I repeat the trial. Any help is appreciated!! <trial prime> /ontrialbegin = [values.itemnumber = counter.mycounter.selectedvalue] /stimulusframes= [1 = soundWAVfile; 500 = video] /trialduration = 3000 </trial> <trial target> /stimulustimes = [400 = soundWAVfile2; 800= picture] /timeout = 3700 /recorddata = true /inputdevice = keyboard /validresponse = ( 19) /responsetrial = (19, repeatprime) </trial> <trial repeatprime> /stimulusframes= [1 = soundWAVfile; 500 = video] /trialduration = 3000 /validresponse = (anyresponse) /responsetrial = (anyresponse, repeatTarget) </trial> <trial repeatTarget> /stimulustimes = [400 = soundWAVfile2; 800= picture] /timeout = 3700 </trial>
	Reply Like 64