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Dear John and List,
The following, from David Mountain, was useful (quoted with permission):
"The conventional wisdom is that the traveling wave is amplified by the
OHCs over a region just basal to the best place. There may not be general
agreement as to how wide this region is, but the available evidence
supports the concept of a distributed amplifier.
High-side suppression means that the excitation peak for the suppressor
is basal to the measurement location. In this case, the amount of
suppression will depend on the distance between the suppressor exciation
pattern and the measurement site. The closer the spacing, the more the
suppression because more of the amplification region is affected. The
suppresor may not be excitatory if it is outside the response area of the
For low-side suppression, the suppressor excitation pattern overlaps with
the entire amplification region. Low-side suppressors may not be
excitatory because the tails of OHC tuning curves are more sensitive than
the tails of IHC tuning curves."
I have to say that I don't entirely understand 2TS. Do low-side and high-side suppression have different properties, given the asymmetry of the frequency- (or place)-dependent nonlinearity?
M Chatterjee, PhD
Asst Prof, Hearing and Speech Sciences
0100 LeFrak Hall
University of Maryland at College Park
College Park, MD 20742