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MIT-OCW-Transcripts

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competing, or masking, stimulus
along with the signal.
And so now, the person with the
hearing aid and sensorineural
hearing loss goes into
the crowded restaurant
and says I hear very well, but
I can't understand the person
across the table speaking to me.
All I hear is this big noise.
And no matter what I-- how
I adjust my hearing aid,
it just sounds noisy.
I can't understand anymore.
I can hear.
They're certainly not deaf, but
they can't understand anymore
because before they had
sharply tuned frequency tuning,
and now they have no
frequency tuning at all.
It's very broad.
That's the problem
that a hearing aid
can't deal with in terms
of restoring normal hearing
to a person with
sensorineural hearing loss.
Before I start to
talk about implants,
let me just remember to say
what other processes affect
our hearing.
And we have a list just so
I don't forget anything.
And one of the important
things is genetic causes.
So maybe you can't see that
from the back of the room,
but number four here
is genetic causes.
There are babies
who are born deaf,
and in the state of
Massachusetts, in most states,
it's mandatory to test infant
hearing at birth because you
want to install a hearing
aid or install a cochlea
implant at a young age if
the baby has hearing loss.
And another cause
that we should list
are certain kinds of infections
and disease processes.
Number five, cause of hearing
loss is diseases, for example,
meningitis.
And one of the MIT
students that I
used to use for demonstration
of cochlea implant
is deaf because at age 12, he
got very sick with meningitis.