Changing the Presentation Positions of Target Stimuli
Hello,
As a part of my research project, I am going to use a version of the dot-probe task to measure attentional adhesion on different types of stimuli. The sequence of this task is as follows: 1) A fixation cross appears in the center of the screen, 2) Target stimuli appear in one quadrant of the screen, 3) Concurrent with the disappearance of the target stimuli, a categorization object (circle or square) appears in either the same quadrant as the target (i.e., filler trials) or in a different quadrant (i.e., attentional shift trials), 4) When categorization object appears, participants' task is to categorize the object as a circle or square, by pressing the pre-defined keys on the keyboard. The important thing is to present both the target stimuli and trial type randomly.
Here is the problem that I am trying to deal with: I could not figure out how to change the presentation positions of the target stimuli and categorization object. Should I specify four different position coordinates in the loop for each of the quadrants (e.g., -480, -280 for the top-left quadrant)? I will be grateful if you have any suggestions 🙏
Thanks a lot for allocating your time! 🐝
Comments
Hi,
I think in one of the more advanced tutorials (WCST, or IAT) scenarios like this receive somewhat more attention. You could check them out to get an idea how to use variables in a smart way:
The general strategy would indeed be to have two variables that code the position of target and of categorization object. If they are independent (and counterbalanced), you can use the loop wizard to let it create the loop table for you. Alternatively, this can be abstract variables names like (top_left, top_right, etc), or already the specific coordinates already. I think it makes more sense to have the variables abstract and assign the specific positions manually afterwards. Here a simple example:
The first the columns I created with the full-factorial design button, the other ones I added manually.
I Hope this helps,
Eduard
Sorry for the late reply Eduard,
It worked really smoothly, thank you so much for your solution!
Best regards,
Sezer