
When we read aloud or listen to someone reading, we use very different brain circuits than when we read silently. One of the earliest demonstrations of brain imaging clearly showed three distinct brain regions lighting up when the same word was read, spoken, or heard. For example, listening to words activated two distinct areas in the left and right hemispheres of the cortex, while speaking words activated the motor cortex on both sides of the brain as well as another part of the brain called the cerebellum.
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