EEG shows brain can simultaneous encode two speech streams

(journals.plos.org)

60 points | by giuliomagnifico 3 hours ago ago

24 comments

  • dr_dshiv 22 minutes ago

    “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

  • lokimedes 20 minutes ago

    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

  • broccoluvr 2 minutes ago

    you guys telling me you still listening to only 1 podcast at the time?

  • subhro an hour ago

    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.

    • TobTobXX 11 minutes ago

      That tracks. As a teacher I sometimes find myself conversing with multiple kids simultaniously as well. If it's nothing too deep that requires full focus, it works. (Though I do find it tiring and avoid it.)

    • junon an hour ago

      Perhaps a dumb question but are they center panned (or mono, i.e. talking over each other) or is it split left ear/right ear when they come through the headset?

      • sigmoid10 an hour ago

        Airplane radios are generally broadcasting and receiving mono. There are modern headsets that can also play stereo, but only for onboard music or intercom purposes, if the plane supports it. But in planes with 2 radios you can usually configure their I/O individually. So you can listen (and also talk, although that makes sense less often) on two frequencies at the same time.

        • junon 21 minutes ago

          Yes of course, the transmitted audio would be mono. I meant one radio in one ear and another radio in the other ear, or if you mix them and they both play in both ears. But it sounds like they're mixed (talking over each other in a single audio stream).

      • subhro 44 minutes ago

        They are mono, but I was trying to say that with practice, you can process 2 independent audio streams simultaneously irrespective of whether they are mono or stereo. For example, I am able to keep track of 2 people talking at the same time. I obviously can't respond to both but can maintain independent contexts.

        • ndr 29 minutes ago

          I wonder if piano players find that easier too, compared to lay people.

  • t23414321 40 minutes ago

    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.

  • latentframe 21 minutes ago

    The simultaneous neural representation is very interesting result here

  • runtime_lens an hour ago

    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.

    • Lomlioto 43 minutes ago

      I def process more than I want.

      Its def a spectrum.

      In the easiest look at people like me who complain very quick if something is wrong like to warm to cold to sweaty etc. and others not even ackknowliding it at all

    • noelwelsh an hour ago

      Absolutely. Take a look at "unconscious perception".

  • j45 34 minutes ago

    The DJ is explained.

  • awestroke an hour ago

    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

    • Perz1val 27 minutes ago

      Not reading out loud, but I've caught myself a few times on reading and not processing that, because I was thinking about something else. Like I still did the reading, but straight to /dev/null of my brain

    • m12k an hour ago

      I experienced this too, when I started reading out loud more. At first, it was just that my eyes would scan ahead a bit from what I was saying, to help me get the right emphasis by knowing where the sentence was going. It felt like I had "handed off" saying the words out loud to a "subroutine", so my attention could be on what I was reading. Then that "readahead" extended to a whole sentence. And at that point it was like I was so far ahead of what I was saying that I had time to think about it a bit. And then at some point it was like the "reading the words" part got handed off to a "subroutine" too, so my attention could mostly stay on whatever I was thinking

    • baxtr 42 minutes ago

      Sometimes I read a book out loud and think about something completely different.

      I wonder if reading aloud might be like walking. I can be walking and speaking to a person at the same time.

    • surfsvammel an hour ago

      This is something that has been studied and is apparently more common when reading out loud. I have this as well. I can read to my kids and at the same time plan the upcoming day. Pretty neat!

  • skor an hour ago

    parents tend to yell at the same time and it needs simultaneous processing

    • eurekin an hour ago

      Also explains why we like music with two simultaneous distinct sections (bass + the rest). One without the other doesn't feel as complete

      • junon an hour ago

        This is a completely different phenomenon. Your ear/brain are tuned to rhythmic beats in the lower frequencies (footsteps). We're better at pattern recognition with the lower frequencies.

        Also, our brains will encode the differences in registers to evoke emotion differently, which is often used by horror films to make a scene scarier[0]. Evolutionarily this is probably to detect screams or babies crying, a rustling bush, etc.

        Speech encoding, at least per this article, has little to do with that. We don't have music encoding so much as we have pattern recognition, instinctual emotional respond to sound, etc.

        Another great video about how music is perceived in animals is [1], just while we're on the topic.

        [0] https://www.atlasobscura.com/articles/how-the-hidden-sounds-...

        [1] https://youtu.be/0ZYhyewNQMo?is=0mWSRAzObOD2p32E