text stringlengths 0 205 |
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the probe anymore. |
And you get the so-called |
psychophysical tuning curve, |
which has this |
very nice tip to it |
and a long low frequency tail |
from a normal hearing person. |
But a person with a |
sensorineural hearing loss |
often has a psychophysical |
tuning curve like this. |
This should remind you |
of the tuning curves |
that we just saw from |
auditory nerve fibers |
in the damaged cochlea, which |
is basically a tipless tuning |
curve. |
Perhaps in this case, |
the outer hair cells |
have been damaged |
by fun with sounds, |
and you have just the |
tail of the tuning curve. |
Now, here we come |
to the crux of why, |
in this person who has |
a sensorineural hearing |
loss-- they still |
have hearing, but they |
have a big loss-- why won't |
just a hearing aid work? |
You can certainly |
install a hearing aid |
into this person's ear canal |
and boost their threshold |
from what they used |
to here down at 0 |
dB to what they |
now here at 60 dB |
You can amplify |
the sound at 60 dB. |
OK, fine. |
Then, they'll start to say, |
yeah, I here it no problem. |
What happens when this person |
goes to a crowded restaurant, |
and there's all this |
low frequency DIN? |
Well before, all the low |
frequency DIN was here. |
It didn't get into |
the response area |
of the sharply |
tuned tuning curve. |
Now, you have all |
this low frequencies |
that's amplified |
by the hearing aid. |
It now gets into the response |
area of the nerve fiber. |
That low frequency |
signal, which you |
don't want to pay attention |
to because you're listening |
at 1 kilohertz, is a |
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