Auditory nerve responses to tones and vocalizations.

<p>(A) FRA of a representative auditory nerve fiber. FRAs were constructed from the responses elicited by tones of varying frequency (x-axis) and intensity (y-axis). (B) FRA of one AN fiber that was responsive to high frequency tones. The white arrow marks the location of a spectral notch created by the pinna. (C) Histogram of the distribution of CFs across the population of AN fibers. (D) Sound pressure waveforms (top panel) and spectrograms (lower panel) for the nine different CBA/Ca mouse vocalizations we tested. Note that all the vocalizations span a frequency range from 60–90 kHz. (E) PSTH of the response of the same fiber to a single mouse vocalization with a duration of 60 ms and averaged over 256 repeats. The spectrogram and sound pressure waveforms are shown at the top and bottom panels respectively. (F) Responsiveness to vocalizations. Each point indicates the SNR for one fiber as a function of the highest frequency for which its responses to tones were significantly greater than its spontaneous activity (F_max). SNR values were averaged across the 9 different calls we tested.