For a long time, people with schizophrenia have reported feeling as though their thoughts and actions were controlled by an outside influence, and people didn’t understand why. One experiment, involving crickets, may have shed some light on the neurology behind that feeling.
It’s interesting how much detail the article goes into for the sake of explaining why we [generally] can’t tickle ourselves. There’s an experiment that was demonstrated on QI about placing your hand next to a fake one, and someone else brushing the fake hand. After a minute (or less for some), people reported feeling the brush strokes on the fake hand.