AI tutor helps kids master the tricky 'R' sound

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Must speak a rhotic dialect of American English as a dominant language. * Must have begun learning English by at least the age of 3 years. * Must be between 9;0 to 17;11 years of age. * Must have reported difficulty with /ɹ/ production. * Must have reported hearing within normal limits. * Must receive a Scaled Score of 5 or above on both the Listening Comprehension and Story Retelling subtests from the Test of Integrated Language \& Literacy Skills (TILLS). * Must receive a percentile score of 8 or below on the Goldman-Fristoe Test of Articulation-3 (GFTA-3) Sounds in Words subtest. * Must have 1 scorable response with 5+ consecutive correct /pataka/ with \> 3.4 syllables per second in the MRR-Tri task of the Maximum Performance Tasks OR must demonstrate no childhood apraxia of speech (CAS-only) features in BOTH articulatory and rate/prosody domains of the ProCAD. * Must score \<40% accurate based on word-level items from our /ɹ/ probe list. * Must score \>=15% accuracy on /ɹ/ on 45 syllables following Dynamic Assessment. * Must express interest in changing their /ɹ/ production. * Must have oral structure and function that are appropriate for /ɹ/ production. * Must have access to broadband internet with videoconferencing capabilities Exclusion Criteria: * Must have no known history of autism spectrum disorder, Down Syndrome, cerebral palsy, intellectual disability, permanent hearing loss, epilepsy/antiepileptic medication, or brain injury/neurosurgery/stroke. * Must not have diagnosis of attention deficit disorder, attention deficit hyperactivity disorder, Tourette's, or Obsessive-compulsive disorder. * Must have no orthodontic appliances that block the roof of the mouth (e.g., palate expanders). * Must not have current cleft palate, fluency disorder, or voice disorder. * Must not demonstrate childhood apraxia of speech (CAS-only) features in BOTH articulatory and rate/prosody domains of the ProCAD.