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variable stimulusframe

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Jens Bölte	Jens Bölte posted 9 Years Ago HOT Topic Details Share Topic
Group: Forum Members Posts: 78, Visits: 60	Hello, I am programming a dot-probe experiments with three different SOAs (one block per SOA). I wonder if it is possible to use a variable for the dot-onset? This I could change from block to block. So instead of assigning a fixed number as here: /stimulusframes = [1 = fixation; 30 = maske; 31 = aufwaermer.neg, aufwaermer.neg.dis; 33 = maske; 34 = dot.pic] I wonder how I could use a variable such as /stimulusframes = [1 = fixation; 30 = maske; 31 = aufwaermer.neg, aufwaermer.neg.dis; 33 = maske; values.onset = dot.pic] At the moment, I get an error message "Missing ',' or '-' before 'values.onset'." Thanks a lot for any help in advance. Jens Tags stimulusframes SOA values
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Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	You cannot use variables (values) in /stimulusframes. Instead you need to use the <trials> insertstimulusframe() function <trial mytrial> / ontrialbegin = [trial.mytrial.insertstimulusframe(picture.dot.pic, values.onset); ] / ontrialend = [trial.mytrial.resetstimulusframes(); ] /stimulusframes = [1 = fixation; 30 = maske; 31 = aufwaermer.neg, aufwaermer.neg.dis ] ... </trial>
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Jens Bölte	Jens Bölte posted 9 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 78, Visits: 60	thanks ;-)
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Jens Bölte	Jens Bölte posted 9 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 78, Visits: 60	Hello, one should always use the proper the example, not a simplified one ;-). It is /stimulusframes = [ 1 = fixation; 30 = maske; 31 = tar.neg.left, dis.neg.left; 33 = maske.left, maske.right; 41 = maske; 42 = dot.pic ] Stimulusframe 33 is the problem. The second insertstimulusframe command "overwrite" the first such that only one mask appears. Suggestion? Best regards Jens Bölte
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Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	> The second insertstimulusframe command "overwrite" the first such that only one mask appears. No, provided your Inquisit installation is up to date, you can add multiple stimuli to the same frame via insertstimulusframe() without problems. Leave frame 33 completely unspecified in /stimulusframes. Inject all the stimuli you want to appear in that frame via insertstimulusframe(). <trial mytrial> / ontrialbegin = [trial.mytrial.insertstimulusframe(text.x, 5); trial.mytrial.insertstimulusframe(text.y, 5); ] / stimulusframes = [1=a; 10=b] / validresponse = (57) </trial> <text a> / items = ("A") / hposition = 20% </text> <text x> / items = ("X") / hposition = 40% </text> <text Y> / items = ("Y") / hposition = 60% </text> <text b> / items = ("B") / hposition = 80% </text>
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Jens Bölte	Jens Bölte posted 9 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 78, Visits: 60	Hello, your are right. It is working the way you described. There must have been an error in my syntax. Thanks a lot. Best Jens
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