Your brain processes most hearing in your auditory cortex. The music floats through the air, hits your ear, your inner ear vibrates in very specific ways, that vibration is translated to electrical impulses that then travel to this area of your brain. You now have neurons that remember the song. When you “hear” a song in your head, your brain is activating those neurons. They’re just being activated without the input of your ear. But you’re “hearing” it the same way (relatively speaking). So when you hear a song in your head, you’re using the area that handles auditory input and memory. If you thought about yourself singing it, or adding a cool guitar solo, you’d probably incorporate other parts of your brain that handle those functions.
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