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Wednesday, October 17, 2012

What does a cochlear implant sound like?


What does Karen hear?

Does she hear 100% normal like I do?

These are questions I hear from people. It is very difficult to explain that while I can "hear" now (I'm on day 6 at current) I do not hear as you do. It is actually very hard to say exactly.  Beep, clicks, etc...

I came across an excellent set of Cochlear Implant Simulation Demos that do a great job of explaining.  The demos give examples of what CI users hear on 1, 2, 4, 8, 16 and 32 Channel Implants.

Click below to navigate to the site:
http://www.hei.org/research/shannon/simulations/

Decrease_Channels contains the original sentence first and then progressively degrades the spectral resolution. The order is: original, 32 channels, 16, 8, 4, 2, and 1 channel. Since the content of the sentence is known, it is possible to understand the sentences down to 4 and even 2 spectral channels. Most cochlear implant listeners are in the 4 to 8 channel range.

Increase_Channels presents the demonstration in the reverse order - starting from poor quality, so that the content of the sentence is not understood at first. As the number of channels is increased from 1 to 2 to 4 you will start to understand the words in the sentence at 4 channels. From 4 to 8 to 32 channels the words are clearer and the sound has better quality. Finally, the original sentence is played.

Music1 presents a clip of a very familiar popular song, with a single male singer. First you will hear the song with 4 channels, then 8, 16, and 32 channels. Finally you will hear the original music clip. Notice that you may understand the words of the song at 4 or 8 channels, even though you may not recognize the melody. Even at 16 and 32 channels the melody is not very good quality.

Music2 presents the opening lines of a very popular and familiar piece of instrumental music. As with previous demo, the number of channels increases from 4 to 8 to 16 to 32. The original music clip is played at the end. Note that you will probably not recognize it even with 32 channels. However if you listen to the sequence repeatedly you will notice that some melodic information is available with 16 and 32 channels, although the quality is still poor compared to the original.

I found these links on this page 
this page of the House Ear Institute's website.

Their website is an excellent source of information.

2 comments:

  1. So how does your hearing improve with time? Do you need software updates to the implant?

    ReplyDelete
  2. So how does your hearing improve with time? Practice, giving the brain time to get used to the sounds and what I'm told it will learn. I'm hopeful...
    Do you need software updates to the implant? As you know technology is always changes in technology. I'm not sure at this point exactly how upgrades work, but I do know they have them.
    I still have 3 more scheduled appointments to fine tune my processor. The last one is in December.

    ReplyDelete

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KJ