The science of tickling: why the brain won’t let us tickle ourselves

Ever tried tickling yourself? Next time you have a private moment, give it a go – you’ll find it next to impossible. With a few well-placed wiggles of the fingers, most of us could send children, friends and even some animals like rats into fits of giggles. The reason we can’t do the same to ourselves has long been a puzzle, but one that we may now be closer than ever to solving. Understanding it requires a deep dive into the workings of the brain; for such a playful activity, the science of tickling is surprisingly sophisticated.