Let my spoiler the performance with the feather. The mentalist of course touched his girlfriend, probably with a thin transparent string between his fingers or

Let my spoiler the performance with the feather. The mentalist of course touched his girlfriend, probably with a thin transparent string between his fingers or hands or maybe just by blowing a bit of air at her. With her eyes closed she could not tell what was going on in the room when she felt the touch, but she felt the touch at some point before or after the other woman was touched with the feather. If you would ask her to immediately say something when she felt a touch, then it would become obvious that she is not feeling the touch when the other woman is touched.