Adank, P; Noordzij, ML; Hagoort, P; (2011) The role of planum temporale in processing accent variation in spoken language comprehension. Human Brain Mapping , 33 (2) 360 - 372. 10.1002/hbm.21218.

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Abstract

A repetition-suppression fMRI paradigm was employed to explore t he neuroanatomical substrates of processing two types of acoustic variation - spe aker and accent - during spoken sentence comprehension. Recordings were made for two speakers and two accents: Standard Dutch and a novel accent of Dutch. Ea ch speaker produced sentences in both accents. Participants listened to two sentenc es presented in quick succession while their haemodynamic responses were recorde d in an MR scanner. The first sentence was spoken in Standard Dutch; the second w as spoken by the same or a different speaker and produced in Standard Dutch or in the artificial accent. This design made it possible to identify neural responses t o a switch in speaker and accent independently. A switch in accent was associa ted with activations in predominantly left-lateralised areas including posterior tempora l regions, including Superior Temporal Gyrus (STG), Planum Temporale (PT), and Supramar ginal Gyrus, as well as in frontal regions, including left Pars Opercularis of the Inferior Frontal Gyrus (IFG). A switch in speaker recruited a predominantly right -lateralised network, including Middle Frontal Gyrus and Prenuneus. It is concluded that posteri or temporal areas, including PT, and frontal areas, including IFG, are involved in processing accent variation in spoken sentence comprehension.

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