Question for loading auditory stimulus.

Back

Question for loading auditory stimulus.

Author	Message
Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 108K	I can't quite make sense of your <trial> specifications, particularly <trial cue> / stimulustimes = [0=blankscreen,fixation; 700=blankscreen; 800=cue] / validresponse = (noresponse) / trialduration = values.soa / recorddata = false </trial> You set the the trial to a fixed duration of 600ms (values.soa), yet try to present 'cue' at 800ms, i.e., after the trial has already terminated. Also, your fixation duration is not 800ms. You display fixation at t0 and then blank it out 700ms later, i.e., the duration is ~700ms. The code excerpts you posted also leave entirely unclear what <trial iti> / stimulustimes = [0=blankscreen] / validresponse = (noresponse) / trialduration = values.dura / recorddata = false </trial> values.dura is. You refer to <trial cue> / ontrialbegin = [values.soa=list.soa.nextvalue; values.cuetype=list.cuetype.nextvalue; values.targettype=list.targettype.nextvalue; values.correctresp=list.correctresp.nextvalue; values.trialcount+=1; values.dura=list.dura.nextvalue] a <list> that isn't in the code you provided. For starters, I would recommend reviewing the "How to Control Trial Duration and Inter-Trial Intervals" topic in the documentation.
	Reply Like 21
ymin1123	ymin1123 posted 11 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 14, Visits: 80	Hi, I modified go-nogo task from inquisit library for auditory go-nogo task. I want each trial to take exactly 3 seconds. Following is modified script. *************************************************************************************************** <list soa> / items = ( 600,600,600,600,600) / selectionmode = sequence </list> <list iti> / items = ( 1200, 1200, 1200, 1200, 1200) / selectionmode = list.soa.currentindex </list> <list targettype> / items = ( 1,2,3,4,5) / selectionmode = list.soa.currentindex </list> <list correctresp> / items = ( 57,57,0,57,0) / selectionmode = list.soa.currentindex </list> <trial cue> / ontrialbegin = [values.soa=list.soa.nextvalue; values.cuetype=list.cuetype.nextvalue; values.targettype=list.targettype.nextvalue; values.correctresp=list.correctresp.nextvalue; values.trialcount+=1; values.dura=list.dura.nextvalue] / stimulustimes = [0=blankscreen,fixation; 700=blankscreen; 800=cue] / validresponse = (noresponse) / trialduration = values.soa / recorddata = false </trial> <trial target> / ontrialbegin = [if (values.correctresp != 0) values.count_go += 1 else values.count_nogo += 1] / stimulustimes = [0=target] / inputdevice = mousekey / validresponse = (lbuttondown, noresponse) / iscorrectresponse = [(trial.target.response =="lbuttondown" && values.correctresp==57) \|\| (trial.target.response == "0" && values.correctresp== 0)] ...... </trial> <trial iti> / stimulustimes = [0=blankscreen] / validresponse = (noresponse) / trialduration = values.dura / recorddata = false </trial> *************************************************************************************************** 1) cue and target stimulus is wave files (sound stimulus) with 200ms duration. What I want to do is set each trial as picture 1. but I'm not sure if cue and target duration is included in SOA(stimulus onset asynchrony) and ITI(inter trial interval) or not. I wonder this task is organized as picture 1 or 2. 2) Does inquisit takes extra time to load wave files? If so, should I subtract extra time from SOA and ITI? 1) picture 1 2) picture 2
	Reply Like 19