Exploring Motor Speech Disorders in Low and Minimally Verbal Autistic Individuals: An Auditory-Perceptual Analysis.

Researchers studied speech difficulties in 54 autistic children and teens (ages 4-18) who have limited verbal abilities. They found that many had motor speech disorders - problems with the physical coordination needed for clear speech. Children showed unclear speech, difficulty with consonant and vowel sounds, and inconsistent speech patterns. These speech motor problems were linked to both understanding and using language, suggesting that helping with speech motor skills might support overall communication development.

This study examined motor speech disorders in 54 low and minimally verbal autistic individuals aged 4-18 years through auditory-perceptual analysis. Three speech-language pathologists evaluated nonspeech oromotor tasks and speech production abilities across 11 features. Results revealed evidence of motor speech disorder characterized by reduced intelligibility, decreased consonant and vowel precision, and impaired speech coordination and consistency. Articulation difficulties were more prominent than other speech subsystem issues.

Notably, speech production was more impaired than nonspeech oromotor abilities in some participants. Oromotor deficits showed significant associations with both expressive and receptive language skills, suggesting potential links between motor functioning and language development in this population.

Findings support systematic assessment of motor speech abilities in minimally verbal autistic individuals. May inform development of targeted speech-motor interventions and early identification protocols. Suggests potential value in addressing oromotor skills as part of comprehensive language intervention approaches for this population.

Single study design without control group comparison. Results require replication in future studies as acknowledged by authors. Sample limited to specific age range and verbal ability level. Reliance on perceptual analysis rather than instrumental measurement techniques.

Motor deficits are widely documented among autistic individuals, and speech characteristics consistent with a motor speech disorder have been reported in prior literature. We conducted an auditory-perceptual analysis of speech production skills in low and minimally verbal autistic individuals as a step toward clarifying the nature of speech production impairments in this population and the potential link between oromotor functioning and language development. Fifty-four low or minimally verbal autistic individuals aged 4-18 years were video-recorded performing nonspeech oromotor tasks and producing phonemes, syllables, and words in imitation. Three trained speech-language pathologists provided auditory perceptual ratings of 11 speech features reflecting speech subsystem performance and overall speech production ability.

The presence, attributes, and severity of signs of oromotor dysfunction were analyzed, as were relative performance on nonspeech and speech tasks and correlations between perceptual speech features and language skills. Our findings provide evidence of a motor speech disorder in this population, characterized by perceptual speech features including reduced intelligibility, decreased consonant and vowel precision, and impairments of speech coordination and consistency. Speech deficits were more associated with articulation than with other speech subsystems. Speech production was more impaired than nonspeech oromotor abilities in a subgroup of the sample.

Oromotor deficits were significantly associated with expressive and receptive language skills. Findings are interpreted in the context of known characteristics of the pediatric motor speech disorders childhood apraxia of speech and childhood dysarthria. These results, if replicated in future studies, have significant potential to improve the early detection of language impairments, inform the development of speech and language interventions, and aid in the identification of neurobiological mechanisms influencing communication development.