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. 2014 Oct 1;8:116. doi: 10.3389/fncir.2014.00116

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Copyright © 2014 Grothe and Pecka.

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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Mammalian hearing originated in the ILD-dominated range. A hallmark of mammalian audiograms is that they are centered in the high-frequency range (>10 kHz), where ILDs are the dominant cue for sound localization. Many recent mammalian species like mice (Mus m.), bats (Eptesicus f.), rats (Rattus n.) and short-tailed opossums (Monodelphis d.) even expanded the high-frequency hearing compared to early mammals (Tachyglossus), allowing for an increase in obtainable ILDs. Only few species including Gerbils (Meriones u.) and man (Homo s.) expanded their hearing range into the low-frequency range, where ITD is an attainable sound localization cue (<2 kHz). Audiograms modified from: Echidna/Tachyglossus: Mills and Shepherd (2001); Monodelphis: Reimer (1995); Mouse: Heffner and Masterton (1980), Radziwon et al. (2009); Bat (Eptesicus fuscus): Koay et al. (1997); Rat (hooded rat): Heffner et al. (1994); Gerbil: Ryan (1976).