Inclusion Criteria:  Must be between 9;0 and 15;11 years of age at the time of enrollment. Must speak English as the dominant language (i.e., must have begun learning English by age 2, per parent report). Must speak a rhotic dialect of English. Must pass a pure-tone hearing screening at 20dB HL Must pass a brief examination of oral structure and function. Must exhibit less than 30% accuracy, based on consensus across 2 trained listeners, on a probe list eliciting rhotics in various phonetic contexts at the word level. Must exhibit no more than 3 sounds other than /r/ in error on the GFTA-3  Exclusion Criteria:  Must not receive a T score more than 1.3 SD below the mean on the Wechsler Abbreviated Scale of Intelligence-2 (WASI-2) Matrix Reasoning Must not receive a scaled score of 7 or higher on the Recalling Sentences and Formulated Sentences subtests of the Clinical Evaluation of Language Fundamentals-5 (CELF-5). Must not have an existing diagnosis of developmental disability or major neurobehavioral syndrome such as cerebral palsy, Down Syndrome, or Autism Spectrum Disorder