Helping Grandma Hear

Some grandmas and grandpas have ears that stopped working well, so voices sound very quiet or fuzzy. It can be sad to miss the sound of singing or laughing. But clever doctors and engineers made an amazing helper. It is a tiny computer that sits on the ear and helps the brain hear again. It is called a cochlear implant, and it works like a bridge between sound and the brain.

In this lesson you will: - Find out how ears turn sound into a message for the brain - Learn what a cochlear implant is and who it helps - See how a tiny computer can send sound to the brain - Think of kind ways to help people who wear hearing helpers

Your ear catches sounds from the air, a bit like a hand catching a ball. Deep inside your ear is a curly part shaped like a snail shell. That curly part has hundreds of tiny hairs. When sound comes in, the little hairs wiggle. The wiggles send a message along a nerve to your brain, and your brain says, that is Mom's voice!

Sometimes the tiny hairs inside the ear get too worn out to wiggle. Then sounds cannot reach the brain, and the world seems very quiet. A cochlear implant does the hairs' job for them. A little microphone sits behind the ear and listens all day. Then it sends the sound past the worn-out part and straight to the hearing nerve. The nerve carries the message the rest of the way to the brain.

Here is the coolest part. The implant turns sounds into tiny electric signals, like a secret code that the brain can read. Beep-buzz-beep! At first the code sounds strange and new, so people practice listening a little every day. Soon Grandma can hear music, laughing, and your voice saying, I love you.