Heather, my VEP was the checkerboard pattern, where I stared at
the red dot
in the middle of
the screen after they attached some electrodes to my scalp.. It took a long time, as I think I lost focus a few times and the machine started over. The tech kept telling me to relax.
First they did larger squares, and then smaller squares. It took a while for me to realize that the patterns were switching, and it came as a surprise.