IAT - third block, combine attributes with images

Angelo

Hey there,
It's the first time I use OpenSesame to set up and run an IAT experiment and unfortunately I'm getting stuck when I've to show two different stimulus categories (the 3rd block of the IAT); in my case I need to randomly present bad/good attributes with due design proposals.
My ideas was to have:

• A loop in which I combined both images and attributes (but I guess this is wrong),
• Within the loop I have:
  * A sketchpad with the [positivenegative] that should show the attributes
  * A sketchpad with the [imgname][version].png that should show the images
  * A common keyboard_response element
  When I try to run the test it shows me, in this third block, only images.

Could you kindly support me on this issue? Attached you can find the source file

Kind regards,
Angelo

Roelof

Hi Angelo,
The duration for the sketchpad with the words is set to zero, which means the experiment immediately jumps to the image and then waits for a keypress. So you could set the duration, and also make sure the box 'flush pending keypresses' is ticked in the keyboard response item to avoid accidental early responses. Hope it works, good luck

Angelo

Hi Roelof,
thanks for your quick reply and I tried to adjust the file according to your suggestion. I made some additional changes, particularly to the loop (called Match1_1). Here is where the experiment crashes.
Opensesame says me that .PNG does not exist, I don't know where is the problem.

Thanks again,
Angelo

Roelof

Right now the variable 'positivenegative' has rows where it has no value, so when the experiment tried to find the PNG with the name 'positivenegative' it cannot find the PNG that is named '' (empty). You would have to think about what the values of the variables should be for each trial, ideally there would be no empty cells.

Angelo

Hi Roelof,
I adjusted the table, so now I do not have any blank cell and it works perfectly.
Thank you for the support!

Regards,
Angelo