Tonotopy
Cortex

The tonotopic organization of the auditory cortex has been extensively examined and is therefore better understood compared to other areas of the auditory pathway. Tonotopy of the auditory cortex has been observed in many animal species including birds, rodents, primates, and other mammals. In mice, four subregions of the auditory cortex have been found to exhibit tonotopic organization. The classically divided A1 subregion has been found to in fact be two distinct tonopic regions—A1 and the dorsomedial field (DM). Auditory cortex region A2 and the anterior auditory field (AAF) both have tonotopic maps that run dorsoventrally. The other two regions of the mouse auditory cortex, the dorsoanterior field (DA) and the dorsoposterior field (DP) are non-tonotopic. While neurons in these non-tonotopic regions have a characteristic frequency, they are arranged randomly.
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