Name: Are headphones destroying our hearing?
Uploaded: 2024-07-04T21:01:10.000Z
Duration: 6 min 49 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

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Recently, I've been wondering if all that listening is bad for me.

And this led to a full-on spiral where I learned the horrifying statistic that over a billion young adults are at risk of permanent avoidable hearing loss.

In a time where we're giving our ears less of a break than ever before, how can we make sure that we're not losing our hearing long-term?

And what tools are at our disposal to ensure that we can minimize that damage?

Like, you know, if you wear headphones, you're not automatically going to develop hearing loss.

I'm a doctor of audiology, so I often go by Dr. Amy.

Dr. Amy explains to me just how fragile our hearing is.

It all has to do with these tiny hair cells in our ears.

So when your hair cells are healthy, they stand up kind of like a field of wheat.

And when the sound comes through, it looks like a tornado has come through and they're all twisted up.

If you're lucky, they're able to sort of rebuild themselves back straight up nice and tall.

But if you do that often enough or if the sound is loud enough, the damage is permanent.

Permanent in the sense that those hairs are bent out of shape forever.

Not naturally, nor do we have treatments that can reverse the effects of it.

This permanent damage is caused by both duration and loudness, which is measured in decibels.

And it works on a logarithmic scale, which means if you're listening to something at 85 decibels and then you raise the volume to 88 decibels, you've actually doubled the loudness, even though it's such a small shift.

And this is where things can quickly get dangerous because we're often listening louder than we realize.

A lot of times it was 110 decibels or it was over 100 decibels.

And it's easy to do because you turn the volume up when you like a song and you don't realize how loud that is.

Especially if you're trying to overpower the sound of a train or the buzz of a coffee shop or your neighbors mowing their lawn.

So for context, the U.S. Department of Labor recommends no more than eight hours of 85 decibel exposure to be considered a safe working environment.

If you dig into your settings on your phone, you can limit your volume to a certain decibel threshold.

But if doing so prevents you from hearing clearly, well, maybe you can lower the volume of the world around you.

The sound you're hearing is coming from this device, which is meant to record what you'd actually hear if you were in this space and if you were using these headphones.

Now, if I'm honest, I always thought that noise cancellation was kind of a marketing tactic, you know, like a neat feature that was pretty cool, but not 100% necessary.

The more I talk to experts, the more I realize that it's actually a protective line of defense in noisy environments.

There are two types of noise cancellation.

Passive noise cancellation, which is when something is physically blocking the sound from coming in, and active noise cancellation.

This is when the headphones have mics that can listen to the sound of the environment.

For simplicity's sake, let's visualize this as a singular wave.

The headphones hear that wave, analyze it, and then generate a sound wave that's the exact inverse of it.

When you put the two together, you get silence.

Our environment is much more complicated than one wave.

There's tons of different dynamic sounds happening all at the same time.

Noise-canceling headphones are best at removing persistent low-frequency hums, anything in the 1,000 hertz range or below.

Think airplane turbines, trains, engine noise.

What's not going to work well with that are higher-frequency sounds.

So these would be like birds chirping or a sudden loud sound.

It doesn't have a chance to analyze and decide what to do with that, so usually the sound is just going to come through.

And when the world still seems too loud, but like, emotionally speaking, sometimes I find it helpful to pause, take a second, and maybe even find somebody to talk to.

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Creating silence in an otherwise noisy environment feels like magic, but it also leads to some weird questions, like does noise cancellation have volume?

In other words, if we're pumping an anti-sound wave to create silence, are our brains inserting into silence while our ear hair cells are still getting wrecked in a quiet tornado?

If it's working properly, it will not produce a sound.

My name is Luke Keller, and I'm a professor of physics and astronomy at Ithaca College.

You can think about it farther up the stream at the eardrum as bouncing back and forth in response to sound waves, but if they're canceled, it's not moving.

There's no vibration to transmit to the inner ear.

So it is literally making the sound go away.

The cancellation happens completely in the electronics, not in your head.

So noise canceling actually does remove the sound, leaving our ear hair cells largely unaffected.

And that's true of just about any pair of headphones that have noise canceling.

So don't feel obligated to get the most expensive, best ones.

Any halfway decent pair will work well enough to protect your ears.

But it is important to note that noise canceling headphones don't work on everything.

Like, if you go to a concert or need to operate a jackhammer, there are way better ways to protect your ears.

But the important thing is that we should be making a conscious effort to protect them.

We think about putting on sunscreen, and we can see when we have a sunburn, but noise damage is invisible.

So it's up to us to be thinking about it, to be mindful of it, and to save our ears.