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Thread: using prior response as stimulus

  1. #1
    Join Date
    Jan 2007
    Posts
    3

    using prior response as stimulus

    Hi, I would like to use the subject's reponse in a previous trial as a stimulus in the next trial. Below is what I did according to the online tutorial, however something doesn't seem to work. Please let me know what I should do to make this work.

    e.g. The possible responses in trial 2 are q, w, e, and r (rt: 16,17,18,19).
    If the subject responds with 'q' (or w/e/r) in trial 2, he/she should see one of the images under stimlist 'q.txt' (or w.txt/e.txt/r.txt) in trial 3.
    Accordingly I put '$=2' in the stim column for trial 3.
    In trial 3, however, I do not get an image but simply a text-form stimulus ('Q').
    All the images are under the relevant stim folder so it doesn't seem to be a problem with the path name.
    Please help.



    The location of the images are all under the relevant stim folder.

  2. #2
    Join Date
    Nov 2005
    Posts
    3,328
    Can you post a zipped copy of your input file and a few stim so I can try to replicate the problem here?

  3. #3
    Join Date
    Jan 2007
    Posts
    3

    my input file

    Hi, this is my input file.
    As you will see, each even-numbered trial uses an image file for a stimulus that is dependent on what the subject responds to in the previous trial.
    The problem is with the 6th and 16th trials. I would like the images to be randomly chosen from one of the four stimlists, depending on the subjects' response in the 5th and 15th trials.
    Hope you can help!
    Attached Files Attached Files

  4. #4
    Join Date
    Jan 2007
    Posts
    3

    please help

    I'm looking forward to hearing back from someone... as I really need to get this problem solved soon.
    Last edited by drseuss; 01-18-2007 at 06:39 PM.

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