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.