The two biggest challenges are:
1) Reason1 must not have any normal means of identifying that he is being stared at. That means eliminating sight, sound, smell, and touch. Preferably, the Starer could see Reason1, but Reason1 could not see the Starer (even if Reason were looking right at the Starer. I think the best option would be to blindfold Reason1 and have the Starer at a remote location--perhaps in a dark room in another building far away peeking through a curtain, or perhaps using two way mirrors.
2) People must stare at Reason1. If Reason1 can tell when someone is staring at him, but not just looking at him, this becomes very tricky. The best I can think of is to have a group of volunteers who are unaware of the actual test and are given instructions that would involve staring at Reason1. For example: Reason1 sits on a chair with his back to the window, volunteers are told, "You will look out the window at the man sitting on the chair for 15 seconds and you must report how many times he looks at you." Of course Reason1 would not look back at any of them, but the volunteers would have to "actively" stare at Reason1. Or perhaps Reason1 would wear a shirt with words on the back and volunteers would be told to memorize the words and only those who can repeat the words are counted (because they were actively staring in order to read the words).
Of course to me this just sounds like a natural phenomenon that everyone experiences where they pick up subtle cues or catch something in their periphery vision and look to see if someone is there looking at them. And sometimes someone is there looking at them.
I have this ability! I wrote elsewhere in the forum about my kitty's penchant for just quietly materializing and sitting there, sending thought beams at either me or Mrs. M. while our backs are turned. More often than not, when I check to see if he's there, he is. Uncanny!
M.