This is not true. The dimensions of the cochlea are basically fixed at the time of birth. As the dimensions of the cochlea are the main contributing factor in

This is not true. The dimensions of the cochlea are basically fixed at the time of birth. As the dimensions of the cochlea are the main contributing factor in what tones are able to be heard, the tonal bandwidths are then set at birth as well (minus hearing loss due to damage as we age). If you are interested in how sound is interperted by the brain, be aware that it is not a straightforward process and takes a bit of research. Still, the cochlea is essentially fixed at the time of birth. More on how the dimensions of the cochlea determine tonal bandwidths: https://en.wikipedia.org/wiki/Hair_cell https://en.wikipedia.org/wiki/Hair_cell [0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3970226/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3970226/ [1] http://www.ajnr.org/content/ajnr/early/2011/09/29/ajnr.A2713.full.pdf http://www.ajnr.org/content/ajnr/early/2011/09/29/ajnr.A2713...