[edited from follow-up support email]

The images that I am looking for would look like this:

>>>>>
>><>>

The arrows scroll from left to right, and the subject needs to determine if the middle arrow is congruent or incongruent with the trailing arrows. They press one button for congruent and one button for incongruent.
We would need for the timing to start when image is completely on the screen. Is there a way of having a cue for the subjects so they know the arrows will be coming? Also, how easy is to to store data? Is there an ASCI file? Thank you for the help!