The Role of the Human Auditory Corticostriatal Network in Speech Learning
Publication in refereed journal

Times Cited
Altmetrics Information

Other information
AbstractWe establish a mechanistic account of how the mature human brain functionally reorganizes to acquire and represent new speech sounds. Native speakers of English learned to categorize Mandarin lexical tone categories produced by multiple talkers using trial-by-trial feedback. We hypothesized that the corticostriatal system is a key intermediary in mediating temporal lobe plasticity and the acquisition of new speech categories in adulthood. We conducted a functional magnetic resonance imaging experiment in which participants underwent a sound-to-category mapping task. Diffusion tensor imaging data were collected, and probabilistic fiber tracking analysis was employed to assay the auditory corticostriatal pathways. Multivariate pattern analysis showed that talker-invariant novel tone category representations emerged in the left superior temporal gyrus (LSTG) within a few hundred training trials. Univariate analysis showed that the putamen, a subregion of the striatum, was sensitive to positive feedback in correctly categorized trials. With learning, functional coupling between the putamen and LSTG increased during error processing. Furthermore, fiber tractography demonstrated robust structural connectivity between the feedback-sensitive striatal regions and the LSTG regions that represent the newly learned tone categories. Our convergent findings highlight a critical role for the auditory corticostriatal circuitry in mediating the acquisition of new speech categories.
Acceptance Date08/12/2018
All Author(s) ListGangyi Feng, Han Gyol Yi, Bharath Chandrasekaran
Journal nameCerebral Cortex
Volume Number29
Issue Number10
PublisherOxford University Press
Pages4077 - 4089
LanguagesEnglish-United Kingdom

Last updated on 2020-15-08 at 03:40