alt Hacker NewsEEG shows brain can simultaneous encode two speech streams
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There is an interesting point about this from animation.
Imagine you are seeing a pendulum clock and it makes a "tick" on one extreme and "tock" on the other.
When they first started doing animation + sound they noticed that if you play the "tock" sound at the exact same time the pendulum hit the extreme, people would think it was delayed.
Research showed that humans required a small amount of time to "context switch" from one stimulus to another. I think it's about 1/16th of a second.
Some interesting other observations about time perception here: https://en.wikipedia.org/wiki/Time_perception
If reading aloud a children story, you may notice you are able to maintain an independent unrelated train of thought. While doing so, I notice that occasionally extra mistakes can "leak" into the story telling - e.g. you read a single word incorrectly, maybe substituting a word from your other train of thought.
As a pilot and a radio officer, I have always been able to process and service 2 audio streams simultaneously. So not surprised with this finding.
Famously, the Apollo Mission control team learned to handle multiple conversations stream simultaneously. The side effect was that going to cocktail parties was a nightmare, because they couldn’t turn it off.
If you couldn't process multiple streams ( audio/visual/other senses ) how would you ever be able to monitor the background for danger and context switch?
There is a difference between conscious experience and what's going on in the background.
I had assumed this was already well known.
My issue is that I can't stop processing other speech streams. It seems other people can tune out conversations around them when talking to a person but I have to hear every word
Many mindfulness practices seem to direct attention at two place at once, to quiet the inner voice. Perhaps this relates to more than just speech, but to attention itself. George Gurdjieff's "The Fourth Way" deals with self remembering, and his pupil, P. D. Ouspensky, has a very vivid description in [1] of how focusing on two things at once leads to a changed state of consciousness, that seems like meditation, and comes from the saturation of the two streams of attention.
[1] https://en.wikipedia.org/wiki/In_Search_of_the_Miraculous
“Bilocation” was one of the legendary superpowers of Pythagoras (he was miraculously able to lecture in two cities at the same time).
Whenever I’m in multiple conversations at once in a social setting, I think of Pythagoras
I wonder if parallel processing is related to musical training or ability.
I've always been jealous of people who can play the drums and sing or play piano with both hands and a foot while singing.
ask any dj who doesnt use modern sync tools and they will tell u, u can follow 2 entire songs out of sync of eachother fine, it takes practice but your brain can get used to these kinda tasks. (ofc very unscientific here :D)
This seems potentially useful for attention-steered hearing aids. A system that waits for complete disengagement from the old speaker may react too slowly
Anecdotally, I have 3 young kids who sometimes all talk to me at once. It's impossible to process, but with 2, I've noticed it IS kinda possible process.
Humans are born with two ears anyways, right?
I do a form of this all the time and I've always wondered "how." I can copy Morse Code--hearing the code and writing it down--while carrying on a conversation with someone else. I'm only "encoding" it, in that I have to read it to know what I just copied. The process of hearing a letter or word in Morse and moving my hand to write it has become so automatic that I can do it while having a live conversation with someone in the room.
It would be interesting to know what's going on in my head with an EEG or FMRI...
Then it is known that if you play to someone with small delay what he says he will be lost on both - so he can't think about and listen to what he is saying if it's not one stream.
This makes me wonder how much of paying attention is really prioritization rather than filtering everything else out. We probably process far more than we're consciously aware of.
Of course, because we have two ears.
Yes, and you can also write two different sentences using two different pens in your hands.
Listening to two talkers at a time is certainly doable...
As is talking whilst listening to another conversation - eg. Giving a lecture whilst eves dropping on the people talking at the back of the lecture theatre.
However, having a two way conversation with one person whilst listening to another is really hard.
Not sure why.
you guys telling me you still listening to only 1 podcast at the time?
The simultaneous neural representation is very interesting result here
"humans have only one language processor" -- this is what I remember from Patrick Henry Winstons lecture
The same is true for music, otherwise canons and polyphony wouldn't work.
Come on guys, the contribution of the research is that it made measurements of how the processing of multiple inputs is represented in EEGs, not whether or not we can handle multiple inputs. Stop acting snarky, it just shows you didn't read beyond the headline.
My wife's brain could probably do that. I'm not so sure about mine.
This is maybe only tangentially relevant to the linked study, but I've noticed I can read aloud from a book on autopilot while thinking about other things or even thinking back on past conversations. I could not do this a few years ago, but now it happens on its own. I wonder how that relates to attention and speech streams
yep, my wife does this routinely
parents tend to yell at the same time and it needs simultaneous processing
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If you can listen to someone play the piano with two hands, it’s a short hop to get to speech.
Related, but this reminds me of the story by Richard Feynman [1] when he practices counting up to 60 seconds in his head, and after many experiments around what he can do simultaneously conclude that he can simultaneously count and read but not speak. Later sharing this to John Tukey, he's told that Tukey can't read while counting but could speak while counting.
Turns out Tukey is visualizing looking at a tape, while he counts, while Feynman imagined himself talking to himself, so he couldn't speak while counting but Tukey couldn't read while counting
>By that experience Tukey and I discovered that what goes on in different people's heads. when they think they're doing the same thing - something as simple as counting - is different for different people. And we discovered that you can externally and objectively test how the brain works: you don't have to ask a person how he counts and rely on his ownobservations of him-self; instead, you observe what he can and can't do while he counts. The test is absolute. There's no way to beat it; no way to fake it.
>It's natural to explain an idea in terms of what you already have in your head. Concepts are piled on top of each other; this idea is taught in terms of that idea, and that idea is taught in terms of another idea, which comes from count- ing, which can be so different for different people!
>I often think about that, especially when I'm teaching some esoteric technique such as integrat- ing Bessel functions. When I see equations, I see the letters in colors-I don't know why. As I'm talking, I see vague pictures of Bessel func- tions from Jahnke and Emde's book, with light- tan j's, slightly violet-bluish n's, and dark brown x's flying around. And I wonder what the hell it must look like to the students.
[1] https://calteches.library.caltech.edu/3591/1/Feynman.pdf