(Roughly) Daily

Posts Tagged ‘hearing

“Since there is no real silence / Silence will contain all the sounds”*…

Sound: it’s so ubiquitous that, unless we’re momentarily thrilled or annoyed by it, we tend to take it for granted. But what is it? Tim Urban to the rescue…

We think of sound as something we hear—something that makes noise. But in pure physics terms, sound is just a vibration going through matter. The way a vibration “goes through” matter is in the form of a sound wave [as per the illustration above]…

Ears are an evolutionary innovation that allows us to register sound waves in the air around us and process them as information—without ears, most sound waves would be imperceptible to a human with only the loudest sounds registering as a felt vibration on our skin. Ears give us a magical ability to sense even slight sound waves in a way so nuanced, it can usually tell us exactly where the sound is coming from and what the meaning of it is. And it enables us to talk. The most important kind of human communication happens when our brains send information to other brains through complex patterns of air pressure waves. Have you ever stopped and thought about how incredible that is?…

The next time you’re talking to someone, I want you to stop and think about what’s happening. Your brain has a thought. It translates that thought into a pattern of pressure waves. Then your lungs send air out of your body, but as you do that, you vibrate your vocal chords in just the right way and you move your mouth and tongue into just the right shapes that by the time the air leaves you, it’s embedded with a pattern of high- and low-pressure areas. The code in that air then spreads out to all the air in the vicinity, a little bit of which ends up in your friend’s ear, where it passes by their eardrum. When it does, it vibrates their eardrum in such a way as to pass on not only the code, but exactly where in the room it came from and the particular tone of voice it came with. The eardrum’s vibrations are transmitted through three tiny bones and into a little sac of fluid, which then transmits the information into electrical impulses and sends them up the auditory nerve and into the brain, where the information is decoded. And all of that happens in an eighth of a second, without any effort from either of you. Talking is a miracle

And so much more: “Everything You Should Know About Sound,” from @waitbutwhy.

See also: 32 Sounds

*  Since there is no real silence,
Silence will contain all the sounds,
All the words, all the languages,
All knowledge, all memory.”

Dejan Stojanović

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As we listen, we might we might recall that it was on this date in 1931 that Alam Ara was released. the first “talkie” (feature film with a sound track), it birthed the modern Indian film business, and set the high-romance, all-singing, all-dancing template for what we now know as Bollywood films (which sell more tickets worldwide than Hollywood films– though with lower grosses, as admission prices are generally lower). Sadly, no copy of Alam Ara survives; in 2017, the British Film Institute joined most Indian film scholars in declaring it the most important of all lost films produced in India.

source

Written by (Roughly) Daily

March 15, 2022 at 1:00 am

“I see by hearing”*…

 

Echolocation_1

Daniel Kish navigates the world like a bat does—and he does so without ever leaving the ground.

After losing his vision as an infant, Kish taught himself to move around with the help of echolocation. Like bats, Kish uses his mouth to produce a series of short, crisp clicking sounds, and then listens to how those sounds bounce off the surrounding landscape. (Our winged neighbors tend to emit these clicks at frequencies humans can’t hear, but Kish’s clicks are perfectly audible to human ears.) From there, Kish makes a mental map of his environment, considering everything from broad contours—like walls and doors—down to textural details.

Kish now teaches echolocation, mostly to students who are blind. For these students, Kish believes that an echolocation practice can buoy confidence and independence. Kish’s own experience is persuasive—he famously bikes along hilly, car-lined streets—and a growing body of scholarly research has begun to unpack exactly how expert echolocaters do their thing. This research has also backed up the idea that this skill is highly learnable. When researchers at the University of California, Berkeley, asked novice echolocators to use tongue clicks to determine which of the two objects in front of them was larger, the newbies were soon able to do so in a way that the scientists couldn’t attribute to chance.

Whatever your sightedness, there’s something to be said for learning to listen more attentively to sonic scenery. Kish believes that vision has a way of blunting the other senses unless people work to really flex them. Deft echolocators, he says, are able to perceive fine differences—distinguishing, say, between an oleander bush (“a million sharp returns”) and an evergreen (“wisps closely packed together, which sound like a bit like a sponge or a curtain”). They’re discovering sonic wonder wherever they go…

A beginner’s guide to navigating with sound: “Teach Yourself to Echolocate.”

* Darrin Lunde, Hello, Bumblebee Bat

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As we take sound advice, we might send closely-heard birthday greetings to Sir Frederic Charles Bartlett, FRS; he was born on this date in 1886.  A psychologist (and the first professor of experimental psychology at the University of Cambridge), he was one of the pioneers of both cognitive psychology and cultural psychology.  His 1932 book Remembering was hugely influential in its demonstration (via the experiments it reports) that memory is not a consultative process that retrieves facts from an immutable record, as most then believed; rather, it is reconstruction, open it a variety of influences that can shape what is recalled.

But relevantly here, he also studied sound and its impact on humans.  His 1934 book The Problem of Noise is a study of “sound that is a nuisance,” and its impact, both physiological and psychological, on hearers.  It was, though probably unintended, Bartlett’s contribution to “clearing the air” for echolation.

Bartlett source

 

Written by (Roughly) Daily

October 20, 2018 at 1:01 am

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