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Siebert (1968) modelled level discrimination based on the information in the firing rate of auditory nerve fibers. The model does a reasonable job over a narrow range of conditions, but misses a large number of effects. Since Siebert's original effort, a number of more advance models have been developed. A more recent model by Colburn et. al (2003) ...


There are quite a few stations between cochlea and the brain and I will focus on the auditory nerve. That said, your theories (a) and (b) are both correct, and therefore (d) applies as well. (a) Neurons in the auditory nerve increase their firing rate when sound level is increased (Heil et al, 2011). This can be regarded as the primary mechanism for ...

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