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. Author manuscript; available in PMC: 2015 Aug 25.
Published in final edited form as: Hear Res. 2011 Feb 4;277(0):134–142. doi: 10.1016/j.heares.2011.01.018

Fig. 4.

Fig. 4

Spectrograms of pitch-shifted versions of the purr call. The 281 Hz version is the original recording of a short purr call from an adult animal which has been digitally manipulated to alter the frequencies of the sound waves making up the call without changing its temporal envelope. The 333 Hz version corresponds to the call from an animal of 44 days old, the 381 Hz version to a 16 day old and the 476 Hz version to an 8 day old animal. Underneath each panel is the population PSTH based on the responses of all 79 units that responded to the call. In the top right corner of each histogram is a number that gives the mean firing rate (spikes/s) and the mean correlation value between the PSTH and the corresponding version of the call.