Comparing Traditional and Biofeedback Telepractice Treatment for Residual Speech Errors

In visual-acoustic biofeedback treatment, participants view a dynamic display of the speech signal in the form of a real-time LPC (Linear Predictive Coding) spectrum. Because correct vs incorrect productions of /r/ contrast acoustically in the frequency of the third formant (F3), participants were cued to make their real-time LPC spectrum match a visual target characterized by a low F3 frequency.

Motor-based articulation treatment involves providing auditory models and verbal descriptions of correct articulator placement, then cueing repetitive motor practice. Images and diagrams of the vocal tract were used as visual aids; however, no real-time visual display of articulatory or acoustic information will be made available.