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" ... In my book, I visited the lab of Gerwin Schalk, who is working on doing just that. Researchers have discovered that when we speak, our brain sends a copy of the intended words not just to the motor cortex to make the sounds needed to communicate, it sends what’s known as an “efference copy” to the auditory cortex, possibly as an error correction mechanism. This is true even when we simply imagine speaking them. ... "