From the neuronal characteristic frequency (CF) and the innervation site in the organ of Corti a place–frequency map was established for characteristic frequencies between 7.2 and 61.8 kHz, corresponding to locations between 90%and 10%basilar membrane length (base = 0%, apex = 100%, mean length measured under the inner hair cells 5.13 mm). The relation between normalized distance from the base (d) and frequency (kHz) can be described by a simple logarithmic function: d(%) = 156.5 − 82.5 × log(f), with a slope of 1.25 mm/octave of frequency. The present map, recorded under physiological conditions, differs from earlier maps determined with different methods. The simple logarithmic place–frequency relation found in the mouse indicates that mice are acoustic generalists rather than specialists.
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