Entracking firing rate rises linearly with tone frequency up to roughly 500 Hz

Evidence

As expected from refractory behavior, there is an upper limit, which varies across neurons and across species. In rare instances neurons will fully entrack at 800 Hz or even higher, but more often the upper limit is near 500 Hz or lower. Over the frequency range of entracking, average firing rate increases linearly with frequency, and depends little on SPL except at low suprathreshold SPLs. One consequence is that neurons may fire at much higher rates to low-frequency stimuli in their “tail” than to tones near their CF (see Fig. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4494