Research suggests how ticklish a body region is tracks how rarely it gets touched — in a…
Nobody in the study was tickled. Volunteers coloured two body silhouettes on screen, and the pattern they drew came out nearly the same in all three languages. Of the five explanations on offer since Aristotle, four came back empty when tested one at a time, and when all five were tested together across eleven body areas, two of them pointed the opposite way.