Speech categories are hierarchically organized along the superior temporal gyrus by linguistic complexity.

Evidence

In humans, the superior temporal gyrus is categorically and hierarchically organized by speech sounds (Binder et al. 2000 ; Chang et al. 2010 ; Leaver and Rauschecker 2010 ): phoneme categories are found in the middle aspect; word categories in the anterior-superior aspect; and phrases in the most anterior aspect (DeWitt and Rauschecker 2012 ; Rauschecker 2012 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 4896