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Neuroscientists have revealed that we cannot tickle ourselves (the gargalesis type) essentially because we can’t surprise our own brain. During a tickle, the skin’s nerve endings shoot electrical signals to the somatosensory cortex, a part of the brain that processes touch. Meanwhile, the anterior cingulate cortex analyzes these signals as either harmful or playful. But [in the back] part of the brain, the cerebellum gives you away. It tells your cortex that you are about to attempt a self-tickle, and not to worry, it should suppress the signals from the tickle. So there is a brain system in place that analyzes the sensory input together with the motor output, basically telling us whether what we feel is due to ourselves or [others]. And in doing so, it also helps us understand how the brain separates “me” from “them.” In fact, some people with dissociative disorders like [Schizophrenia] can tickle themselves silly. Being able to [differentiate] the actions of others and ourselves is central to our sense of self.

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