Mammalian Ear, The
The evolution of the mammalian ear and the comparative research with the ears of humans.
In order to understand the evolution of the human ear, we must trace its origins and comparison in the mammalian lineage. Therefore, to identify the changes in the hearing capacity of the evolution of humans, a comparison had to be made to the evolution of other mammals (Masterton et al. 1968). It was concluded that high frequency hearing (>32 kHz) is a trait that characterizes mammals. This was due to the short distance of their ears, and the result for the selective pressure to know the accurate source of brief sounds. Sounds with a low frequency (<1 kHz) is a trait that characterizes all mammals, especially humans (Masterton et al. 1968).
The Eutherian Mammalian Ear
Regarding the evolution of the eutherian mammalian ear, Manley (2017) distinguished that during the Paleozoic era (>250 million years ago), the synapsids were no longer under the stem...
- Gelfand, S. A. (2010). Chapter 4: Cochlear mechanisms and processes. In S. Gelfand (Ed.), Hearing: An introduction to psychological and physiological acoustics (5th ed., pp. 72–102). London: Informa Healthcare.Google Scholar
- Moller, A. R. (2013). Hearing. Anatomy, physiology, and disorders of the auditory system (3rd ed.). San Diego: Plural Publishing.Google Scholar
- Radojevic, V., Levano, S., Brand, Y., Naldi, A., Pak, K., Ryan, A., et al. (2015). All Akt isoforms (Akt1, Akt2, Akt3) are involved in normal hearing, but only Akt2 and Akt3 are involved in auditory hair cell survival in the mammalian inner ear. PLoS One, 10, 1–13. https://doi.org/10.1371/journal.pone.0121599.Google Scholar
- Vazquez, A. E. (2016). α9α10 acetylcholine receptors: Structure and functions. Neurotransmitter, 3, e1298.Google Scholar