Phonetic Inflexibility in Autistic Adults.

Area of Science:

• Linguistics
• Neurodevelopmental Disorders
• Speech Science

Background:

• Atypical speech patterns are frequently observed in autistic adults.
• The underlying mechanisms of this speech style, particularly phonetic inflexibility, require further investigation.

Purpose of the Study:

• To investigate whether autistic adults display phonetic inflexibility in their speech production.
• To determine if this inflexibility is related to the control of phonetic behavior or the realization of their phonological repertoire.

Main Methods:

• Two tasks were administered to 20 autistic and 20 neuro-typical adults: producing native vowels and imitating artificial vowel-like sounds.
• Acoustic properties of vowel production and imitation were analyzed to assess articulatory stability and flexibility.

Main Results:

• Autistic adults demonstrated greater articulatory stability in producing native vowels.
• When imitating artificial vowels, autistic adults showed less variability but were more influenced by their native vowel space.

Conclusions:

• The findings suggest that phonetic inflexibility in autistic adults stems from a lack of flexibility in producing their native vowels.
• This articulatory stability appears to be partly independent of pragmatic constraints and register selection.