In certain circumstances, speech and language therapy is proposed in telepractice as a practical alternative to in-person services. However, little is known about the minimum quality requirements of recordings in the teleassessment of motor speech disorders (MSD) utilizing validated tools. The aim here is to examine the comparability of offline analyses based on speech samples acquired from three sources: (1) in-person recordings with high quality material, serving as the baseline/gold standard; (2) in-person recordings with standard equipment; (3) online recordings from videoconferencing. Speech samples were recorded simultaneously from these three sources in fifteen neurotypical speakers performing a screening battery of MSD and analyzed by three speech and language therapists. Intersource and interrater agreements were estimated with intraclass correlation coefficients on seventeen perceptual and acoustic parameters. While the interrater agreement was excellent for most speech parameters, especially on high quality in-person recordings, it decreased in online recordings. The intersource agreement was excellent for speech rate and mean fundamental frequency measures when comparing high quality in-person recordings to the other conditions. The intersource agreement was poor for voice parameters, but also for perceptual measures of intelligibility and articulation. Clinicians who plan to teleassess MSD should adapt their recording setting to the parameters they want to reliably interpret.

Background: Vocoid epenthesis within consonant clusters has been claimed to contribute to the diagnosis of apraxia of speech. In clinical practice, the clinicians often doubt about the correct production of clusters as the C-C transition may be minimally disrupted. Aims: To demonstrate the value of acoustic analysis in clinical practice as a reliable complement to perceptive judgment. Methods & Procedures:We compared the acoustic signature and the perceptive detection of vocoid epentheses in unvoiced consonant clusters within pseudo-words produced by 40 participants presenting different subtypes of motor speech disorders (including apraxia of speech (AoS) and dysarthria) and matched neurotypical controls. Outcomes & Results:The results indicate that vocoid epenthesis was acoustically visible in 3 out of 10 participants with AoS, and in one out of 30 participants with dysarthria. One-quarter of these vocoid epentheses was not detected via auditory perception by expert listeners (speech and language therapists) who also made false detections. Conclusions:The current results indicate that vocoid epenthesis is not systematic at least in mild AoS. Moreover, an important proportion is misdetected by ear, even by expert clinicians, meaning that visualisation of the acoustic signal can be of precious help.

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