Subject: two-tone suppression... From: Monita Chatterjee <mchatterjee(at)HESP.UMD.EDU> Date: Thu, 22 Sep 2005 14:53:03 -0400Dear 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 measurement location. 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? Thanks, Monita M Chatterjee, PhD Asst Prof, Hearing and Speech Sciences 0100 LeFrak Hall University of Maryland at College Park College Park, MD 20742 301-405-7716 (Voice) 301-314-2023 (Fax)