2 of 8

LESSON 5 · Light, Sound & the Invisible Spectrum

Your Brain's Audio Mix

Every time you speak, your brain runs a live mixing session. It blends two inputs: the air-conducted sound coming in through your ear canals, and the bone-conducted sound humming through your skull.

You have heard this exact blend since you first babbled as a baby. Over the years it became the voice you think of as yours — a version that exists only inside your head.