“…7 This gyrus, known today as Heschl's gyrus, is understood to contain the primary auditory cortex, as it reliably exhibits tonotopic maps 3 (i.e., how sound frequencies map to different locations) presumably originating from the tonotopic maps encoded by the cochleae. Myriad investigations of Heschl's gyrus have been carried out related to many aspects of auditory processing, including developmental maturation, 15 normal auditory processing, 10 disorders of auditory processing such as autism, 18 pitch processing in musicians, 20 and auditory hallucinations in schizophrenia, 2 among many others. A number of techniques have been used to examine the auditory cortex, including transcranial direct current stimulation, 11 PET, 13 magnetoencephalography, 9 and functional MRI (fMRI).…”