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Thread: Link stimuli (case 9748)

  1. #1
    Join Date
    Sep 2013
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    2

    Link stimuli (case 9748)

    Hello,

    Is there a way to link stimuli in trial? For example, if I have a set of images and a set of text, I want image 2 to be linked with text 2. I would also like the stimuli "set" to be randomly selected.

  2. #2
    Join Date
    Feb 2013
    Posts
    1,094
    Have you looked at the "Yoking Random Pairs" section of the DirectRT manual?
    Jason Reed
    Empirisoft Software Support Specialist

  3. #3
    Join Date
    Sep 2013
    Posts
    2
    Thanks. That is exactly what I was looking for. Using the setup above, is it possible to randomly select between a set of positions? For instance, if there are two images, one on the left and one on the right, I want to set up the experiment so that it randomly selects between position 1 (image 1 on the left and image 2 on the right) and position 2 (image 1 on the right and image 2 on the left). Furthermore, I want to make sure the randomization is balanced so that it selects position 1 or position 2 50% of the time. In my set of stimuli, there will only be this set that will need to be randomly positioned.

  4. #4
    Join Date
    Feb 2013
    Posts
    1,094
    You can build off of the basic yoking random pairs function to create the display of two different stimuli in two different positions. Basically, it involves creating one block of trials where one stimlist is selected from randomly (using $listname in the stim field) on the left side of the screen and another stimlist is randomly yoked (using &listname^-1 in the stim field)on the right side of the screen. You then create a second block of trials in which you simply swap the lists.

    If you open the example input file I attached, you can see that the block one places the numbers on the left side of the screen and the word for that number on the right side of the screen. Block two swaps the positions, with the word for the number on the left side of the screen and the number on the right side of the screen. I also needed to create two copies of each number and word file so that DirectRT did not get confused when creating yoked pairs; I added _left and _right the names of each number and word list so that it was easy to put the stimlist names in their proper place in the input file.

    If you run this, you will also notice that you can random the presentation of each trial using the bgr and wgr (like I did here) fields. Feel free to play around with the attached files and to let me know if you have any questions about them.
    Attached Files Attached Files
    Jason Reed
    Empirisoft Software Support Specialist

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