The correct order of brain area activation if someone understood a sentence and repeated it aloud is Wernicke's area, Broca's area, primary motor cortex.
Wernicke's area is present in the left hemisphere and is a system responsible for sound comprehension. The broca's area is also located in the left hemisphere in the frontal lobe and is responsible for language. The primary motor cortex is the area responsible for moving the human body.
Therefore, each time we hear, speak and move we activate different brain areas related to such functions.
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