Just Noticeable Difference, Sandpaper, and Synesthesia

A cool thing happened in psychology class on Friday - we were talking about amount of difference required to notice a difference (just noticeable difference). We used sandpaper and people felt one piece then another (it could be the same or different) with their eyes closed and had to see if they knew if it was the same. Max was able to get each one because he subconsciously had a color/pattern in his mind for the texture. He was able to ace the test because of synesthesia:)