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So current cochlear
implants only
can be pushed in about to cover
the basal half of the cochlea,
the basal 50%.
So that seems like
a huge limitation.
It's a bit of a limitation.
Fortunately, it's not
an extreme limitation
because the spiral ganglion
doesn't go all the way
to the apical part
of the cochlea.
The ganglion is where the cell
bodies of the auditory nerve
is.
And so there is ganglion that
ends about 3/4 of the way out,
so the last quarter
wouldn't be helpful anyway.
And here are the
various electrodes
along the cochlear implant.
And modern cochlear
implants have 22 electrodes.
And they are hooked up.
I'll show you how they're
hooked up in just a minute.
Actually, I'll show you how
they're hooked up right now.
The way this works is
the microphone signal
comes into the speech
processor here,
and the microphone signal is
split up into various bands.
The microphone might pick
up only high frequency,
in which case, this
band would be active,
or it might pick up middle
frequencies, in which case
these bands would be active, or
it might pick up low frequency
or it might pick
up all frequencies.
It depends on what the sound is.
The output of those filters
is sent to some processing
schemes, which eventually result
in little electric pulses,
and those are shocks
that are sent down
into the cochlear
implant electrodes.
And this is supposed
to be-- actually
something's not happening
here automatically.
This is supposed to be
electrode number one, which
is the most apical electrode,
and so on and so forth.