Differences in speech articulatory timing and associations with pragmatic language ability in autism.
Tiny speech-timing gaps in adults with autism link to real-world pragmatic struggles and can be tracked acoustically.
01Research in Context
What this study did
Lau et al. (2023) used a computer tool to measure tiny timing gaps in speech. They looked at adults with autism and compared these gaps to their scores on prosody and pragmatic language tests.
The team also checked if parents' genes changed the results. They wanted to know if small speech-timing slips link to real-world communication problems.
What they found
Adults with autism showed small but clear timing shifts when they spoke. These shifts were tied to lower prosody and pragmatic language scores.
The timing differences stayed even after ruling out parental genetic risk. This means the speech pattern is part of autism, not just family history.
How this fits with other research
Diehl et al. (2012) first saw longer utterance durations in kids with autism. Y et al. now show the timing issue continues into adulthood and links to social language.
Kissine et al. (2019) found adults with autism had more stable vowel sounds, which seems opposite. The two studies looked at different parts of speech: vowel steadiness versus consonant-voice timing. Both can be true at once.
Boorom et al. (2022) used an automated tool to show parent-child vocal turn-taking is stiffer in ASD. Y et al. show the stiffness also lives inside the person’s own articulation.
Why it matters
You can add a quick acoustic check to your pragmatic language assessment. Record a short speech sample and look for tiny timing gaps with free software. If the gaps are off, add articulation drills or pacing cues to your pragmatics goals. This gives you an objective marker that tracks progress beyond teacher ratings.
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02At a glance
03Original abstract
BACKGROUND: Speech articulation difficulties have not traditionally been considered to be a feature of Autism Spectrum Disorder (ASD). In contrast, speech prosodic differences have been widely reported in ASD, and may even be expressed in subtle form among clinically unaffected first-degree relatives, representing the expression of underlying genetic liability. Some evidence has challenged this traditional dichotomy, suggesting that differences in speech articulatory mechanisms may be evident in ASD, and potentially related to perceived prosodic differences. Clinical measurement of articulatory skills has traditionally been phoneme-based, rather than by acoustic measurement of motor control. Subtle differences in articulatory/motor control, prosodic characteristics (acoustic), and pragmatic language ability (linguistic) may each be contributors to differences perceived by listeners, but the interrelationship is unclear. In this study, we examined the articulatory aspects of this relationship, in speech samples from individuals with ASD and their parents during narration. METHOD: Using Speechmark® analysis, we examined articulatory landmarks, fine-grained representations of articulatory timing as series of laryngeal and vocal-tract gestures pertaining to prosodic elements crucial for conveying pragmatic information. RESULTS: Results revealed articulatory timing differences in individuals with ASD but not their parents, suggesting that although potentially not influenced by broader genetic liability to ASD, subtle articulatory differences may indeed be evident in ASD as the recent literature indicates. A follow-up path analysis detected associations between articulatory timing differences and prosody, and subsequently, pragmatic language ability. CONCLUSION: Together, results suggest a complex relationship where subtle differences in articulatory timing may result in atypical acoustic signals, and serve as a distal mechanistic contributor to pragmatic language ability ASD.
Research in autism spectrum disorders, 2023 · doi:10.1016/j.rasd.2023.102118