Alternating Stimuli with Rating pages

Back

Alternating Stimuli with Rating pages

Author	Message
Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 108K	> Related to your branch suggestion however, if I did do a branch, could I time the trial and the branch within the trial separately? A /branch is executed when the parent <trial> element terminates. So the answer is "no". > Since I am dealing with a large number of picture stimuli, do I have to hardcode the name of each one individually in my item > element? Yes. The reason is that Inquisit must make sure that every file the script needs actually exists and is available to avoid catastrophic runtime failures on optimize performance.
	Reply Like 18
ashaw	ashaw posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 5, Visits: 22	The sequence command is perfect for what I need. Related to your branch suggestion however, if I did do a branch, could I time the trial and the branch within the trial separately? Additionally, I had one more quick question. Since I am dealing with a large number of picture stimuli, do I have to hardcode the name of each one individually in my item element, or is there a file reader that can pull in image files from a specified path ( something similar to the python capability)? Thanks again for the help!
	Reply Like 17
Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 108K	<block> /trials = [values.count= noreplacenorepeat(practiceTrial); 2,4= likertpracticeTrial] </block> The above is not possible -- it's invalid syntax and variables as trial numbers are not allowed. Why don't you simply do: <block> /trials = [1-2 = sequence(practiceTrial, likertpracticeTrial)] </block> ? Note that noreplacenorepeat(practiceTrial) makes no sense if you only have one element (here:practicetrial). Other options: #1: Use /branch to run the likerts as in <trial practicetrial> ... / branch = [likert.likertpracticetrial] </trial> <block someblock> / trials = [1-2=practicetrial] </block> #2: If you require really complex selection, use <list> elements. <list triallist> ... </list> <block someblock> / trials = [1-2=list-triallist] </block> For details, refer to the language reference on the <list> element. Unrelated addendum: <trial practice> /stimulusframes = [1=practice] /ontrialbegin = [ values.count + 2] </trial> is invalid syntax and ought to read <trial practice> /stimulusframes = [1=practice] /ontrialbegin = [ values.count += 2] </trial> '+=' is the increment operator; for details please refer to the 'operators' topic in the documentation.
	Reply Like 17
ashaw	ashaw posted 11 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 5, Visits: 22	Hi! I'm working on an experiment whereby I'm trying to alternate a stimuli page with a rating page. I know how to do this manually in the block element as follows: <block> /trials = [1,3= noreplacenorepeat(practiceTrial); 2,4= likertpracticeTrial] </block> However, I'm trying to automate this alternation using a counter since the number of pages that I have to alternate is quite large. I tried to define a count using the following code outside of the block: <values> count = 1 </values> Then I edited the trial code as follows: <trial practice> /stimulusframes = [1=practice] /ontrialbegin = [ values.count + 2] </trial> I then edited my block code from above as follows: <block> /trials = [values.count= noreplacenorepeat(practiceTrial); 2,4= likertpracticeTrial] </block> This count method did not work because Inquisit did not recognize values.count as being an integer and returned an error saying that trial1 was undefined. I I would appreciate any help in figuring out a simpler count method that can automate alternation of the pages. Thank you!
	Reply Like 18