Jordan ran participants in the fall term for experiments on covert attention, amongst other things. These participants were SFU undergrad psychology students earning credits towards their courses. After being greeted with a consent form the participants were moved into little rooms in front eye trackers to examine their every twitch.
Covert attention is where participants act with information that they seem to have never looked at. It seems as if they are getting information without actually fixating on the item in question. If you’re curious about this check out this conference poster on it.