using prior response as stimulus

[jarvis24]

Can you post a zipped copy of your input file and a few stim so I can try to replicate the problem here?

[drseuss]

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!

[drseuss]

I'm looking forward to hearing back from someone... as I really need to get this problem solved soon.