Experiments suggest a brain signal called corollary discharge, which helps us distinguish the sensory experiences we produce ourselves from those produced by external stimuli, plays an important role in our experiences of internal speech, he said.
Corollary discharge is a type of predictive signal generated by the brain that helps to explain, for example, why other people can tickle us but we can't tickle ourselves, he said.
The signal predicts our own movements and effectively cancels out the tickle s
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