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phenomenon with no basis
that we know about.
We'll talk about permanent
and temporary hearing
loss, the various
causes of hearing loss,
and then, at the end, we'll
talk about the various neural
prostheses, or implants, that
are used to restore hearing.
And the most famous
of those, of course,
is the cochlear implant.
We hope to have a visit
from a subject who's
deaf, who uses a
cochlear implant,
and she'll be able to
demonstrate her implant to you
and answer questions if
you want to ask them of her
about her cochlear implant.
We'll also cover a couple
other different types
of implants that are
used to restore hearing.
So this first slide talks about
sensorineural hearing loss
in general.
And a very common pattern of
sensorineural hearing loss,
which comes from the basal
turn being most affected.
This is an audiogram,
if you will,
a graph of hearing level in
terms of sound pressure level,
hearing threshold as a function
of sound frequency for,
in this lower curve,
a normal hearing
human and, in this upper curve,
a typical pattern for someone
who has a mild to moderate
sensorineural hearing loss.
And so as you can
see, this individual
with the hearing loss has
perfectly normal hearing
thresholds up to the middle
frequency, 1,000 Hertz,
but then their
threshold of hearing
deviates from the normal so
that by about 10,000 Hertz,
they have a hearing
loss of 60 dB or so.
This is a very common
pattern of hearing loss that
arises because, for some
reason, the basal turn is
more affected.
The basal turn is where
you have the responses
to the very highest