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Listen to a Quartet Sing While You Watch a Close-up of Their Vocal Cords

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The human voice box is a strange and amazing thing. In this video of a quartet singing, you can see the voice box in action via laryngoscope—a tiny camera on a flexible tube inserted through the nose and down the throat.

First, you see the camera enter the nostril and continue over the back of the tongue until you see the larynx. The opening in the center is the entrance to the airway. The whitish bands on either side of the opening are the vocal cords. When they are open, that means the singer is taking a breath. When they are closed, the air is being pushed through them, making them vibrate and create sound. Muscles around the cords adjust the tension on them so they lengthen (making them vibrate faster and produce a higher tone) or shorten (making them vibrate slower and produce a lower tone).

The large flap of cartilage in front of the larynx is the epiglottis. It closes over the larynx when we swallow, so food is shunted back to the esophagus and away from the airway. The process is not failsafe—the human larynx is positioned much lower than it is in other animals, making us vulnerable to choking. But that lower position allows for speech and song, which are enough of an evolutionary advantage to make the risk worth it. We have learned to manipulate this complex machinery to make something not only useful, but beautiful. We pay for it with our own fragility.

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Can You 'Hear' These Silent GIFs?
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GIFs are silent—otherwise they wouldn't be GIFs. But some people claim to hear distinct noises accompanying certain clips. Check out the GIF below as an example: Do you hear a boom every time the structure hits the ground? If so, you may belong to the 20 to 30 percent of people who experience "visual-evoked auditory response," also known as vEAR.

Researchers from City University London recently published a paper online on the phenomenon in the journal Cortex, the British Psychological Society's Research Digest reports. For their study, they recruited more than 4000 volunteers and 126 paid participants and showed them 24 five-second video clips. Each clip lacked audio, but when asked how they rated the auditory sensation for each video on a scale of 0 to 5, 20 percent of the paid participants rated at least half the videos a 3 or more. The percentage was even higher for the volunteer group.

You can try out the researchers' survey yourself. It takes about 10 minutes.

The likelihood of visual-evoked auditory response, according to the researchers, directly relates to what the subject is looking at. "Some people hear what they see: Car indicator lights, flashing neon shop signs, and people's movements as they walk may all trigger an auditory sensation," they write in the study.

Images packed with meaning, like two cars colliding, are more likely to trigger the auditory illusion. But even more abstract images can produce the effect if they have high levels of something called "motion energy." Motion energy is what you see in the video above when the structure bounces and the camera shakes. It's why a video of a race car driving straight down a road might have less of an auditory impact than a clip of a flickering abstract pattern.

The researchers categorize vEAR as a type of synesthesia, a brain condition in which people's senses are combined. Those with synesthesia might "see" patterns when music plays or "taste" certain colors. Most synesthesia is rare, affecting just 4 percent of the population, but this new study suggests that "hearing motion synesthesia" is much more prevalent.

[h/t BPS Research Digest]

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The Google Docs Audio Hack You Might Not Know About
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To the uninitiated, Google Docs may take some warming up to. But although it may seem like any other word processor, Docs offers its fair share of nifty features that can make your life a whole lot easier. The only problem is that few people seem to know about them.

The Voice Typing function is one such example. As Quartz discovered, this tool can be used to drastically cut down on the time it takes to transcribe an interview or audio recording—a feature that professionals from many fields could benefit from. Voice Typing might also be useful to those who prefer to dictate what they want to write, as well as those with impairments that prevent them from typing.

Whatever the case may be, it's extremely easy to use. Just open a blank document, click on "tools" at the top, and then select "voice typing." A microphone icon will pop up, allowing you to choose your language. After you've done that, simply click the icon when you're ready to start speaking!

Unfortunately, it's unable to pick up an audio recording played through speakers, so you'll need to grab a pair of headphones, plug them into your phone or voice recorder, and dictate what's said as you listen along. Still, this eliminates the hassle of having to pause and rewind in order to let your fingers catch up to the audio—unless you're the champion of a speed typing contest, in which case you probably don't need this tutorial.

According to Quartz, the transcription is "shockingly" accurate, even getting the spelling of last names right. For a how-to guide on the Voice Typing tool, check out Quartz's video below.

[h/t Quartz]

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