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Sound and how the brain reacts to it

Human Anatomy, Physiology, and Medicine. Anything human!

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Re: Sound and how the brain reacts to it

Postby GremlinGnome422 » Mon Jul 01, 2013 7:25 pm

I actually have the same response with my ears when it comes to rustling noises,my ears start to have a tingling sensation & I feel pleasant ,but I thought this article might give some hindsight to what causes this. Good Luck

"The ear’s amazing sensitivity to faint sounds comes from cells with hairlike protrusions in the inner ear. The exact mechanism remains a mystery, but a recent experiment explores how spontaneous vibrations in these hair cells synchronize intermittently with weak mechanical signals. As described in Physical Review Letters, the observations suggest that hair cells may respond to sounds through changes in the timing (or phase) of their internally driven vibrations.

The inner ear contains thousands of hair cells, each with a “hair bundle” of 30–50 protrusions. Sound waves entering the ear can induce hair bundle vibrations, which are converted into electrical signals and sent to the brain. What remains unexplained is how the weakest audible sounds are detected, since they excite vibrations below the thermal noise background in the ear. The answer may be active amplification. Previous experiments performed in vitro found that bundles oscillate spontaneously from an internal driver, and this motion could synchronize with a small external input.

Yuttana Roongthumskul and colleagues from the University of California, Los Angeles, have performed new in vitro experiments on individual hair bundles from a bullfrog auditory system. Unlike previous observations that focused on the amplitude response, the team recorded the phase of spontaneous oscillations as the bundles were stimulated with a vibrating glass fiber. High-speed camera data showed the degree to which the bundles synchronized with the stimulating signal. For relatively strong stimulations, fiber and bundle motions had a constant phase difference (i.e., they were “phase-locked”). But for weaker stimulations, the hair bundles exhibited “phase slips” as they temporarily lost synchronization and then regained it. The authors believe this intermittent synchronization, occurring in an ensemble of cells, provides a possible model for sensitivity at the lower limit of audibility."- Michael Schirber


http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.110.148103
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Re: Sound and how the brain reacts to it

Postby Richard02 » Wed Jul 10, 2013 6:46 am

I had various tests including echocardiogram and regular holter monitor testing at home.
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Re: Sound and how the brain reacts to it

Postby Ngentile86 » Tue Jul 30, 2013 4:26 am

I'm so happy I found this!!!! I thought I was the only one with this condition. I realized that I had this when I was in grammar school and the sound of my peers turning pages in our text book could put me to sleep in a few minutes. There are also other sounds like some people's voices, people opening up bags of chips lol I feel like such a weirdo. The sound of someone going through their purse can also put me to sleep! I cant explain the feeling, its almost euphoric. I'm so glad not alone in this ;)
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Postby animartco » Sat Aug 24, 2013 11:07 am

This is a very interesting discussion and I am surprised I haven't looked into it before. It is a question of degree isn't it? We all find certain sounds evocative. Most often it is music that we associate with happenings in the past. There are pieces of music that always make me cry. And there is 'spooky' music used in all horror films which actually heightens the tension and makes the spine creep, before anything horrible happens. Rather like Pavlov's dogs salivating at the sound of a bell. So sound does evoke physical responses by association. And just small sounds can 'lift' you by affecting chemicals in the brain. For me it's seagulls crying that gives me this sudden tingle. I do not know where the memory came from. It could have been a composite of all the times I was taken to the seaside as a child.
But library books being shelved? I take it that must come from the school library. The memories that cause this response can be happy or sad. I don't think that makes a difference, strangely. The important thing is that they are associated with either very strong emotions, or frequently repeated emotions.
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Re: Sound and how the brain reacts to it

Postby angwal » Sat Sep 28, 2013 3:42 am

I also have this same reaction. After all this time that it has happened to me, I decided to search for it on the internet because I knew I couldn't be the only one. There are so many posts already, but I just wanted to say that I saw a documentary once that said during the time we were in the womb in our mom we heard things very differently, pretty much like being underwater. Everything is muffled and many sounds, as an adult, like rustling papers, someone sweeping, or voices are all emulating the sounds we heard in the womb that soothed us. So we become very relaxed & protected. I think this is just part of it, and I also think its sounds from when I was a child that were comforting.

Weirdly enough what does it for me is my dogs grooming themselves or bitting their nails. Then I also noticed sweeping is the same. But for me its such a relaxed state that I could go to sleep at any moment, but its also like a heightened state of brain function. I seem to concentrate better & work better when I hear these sounds. I want to see if I can simulate it by getting sounds off of YouTube. It looks like it works for some people.

Happy listening to everyone :-)
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