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. 2013 Oct 30;7:72. doi: 10.3389/fnsys.2013.00072

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Copyright © 2013 Wallace, Grimsley, Anderson and Palmer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) The waveform and (B) the spectrogram of the example of chutter used in this study. The eight temporal elements of the call that are capable of producing a neuronal response at low sound levels are indicated by the letters (a) to (h) below the time axis. Quieter elements of the call that only produce a neuronal response at relatively high sound levels are indicated by the letters (w) to (z). (C) Responses of a unit in AI(LF) to the chutter call presented at four different attenuation levels from −65 dB (quietest) to −35 dB (loudest). Individual peaks in the response corresponding to the different temporal elements of the spectrogram are indicated by the same letters as in panel (B). This unit had a CF of 1 kHz and a pure tone threshold of 25 dB SPL. (D) Separate unit in AI(LF) which showed different responses to chutter at two different levels of attenuation. This unit had a CF of 0.4 kHz and a pure tone threshold of 58 dB SPL.