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Related Experiment Video

Updated: Jul 14, 2026

Portable Intermodal Preferential Looking (IPL): Investigating Language Comprehension in Typically Developing Toddlers and Young Children with Autism

Portable Intermodal Preferential Looking (IPL): Investigating Language Comprehension in Typically Developing Toddlers and Young Children with Autism

Published on: December 14, 2012

Expressive language in persons with Prader-Willi syndrome.

J Van Borsel¹, T Defloor, L M G Curfs

¹Department of Ear, Nose & Throat, Ghent University Hospital/Ghent University, Ghent, Belgium. john.vanborsel@ugent.be

Genetic Counseling (Geneva, Switzerland)

|May 23, 2007

Summary

Language difficulties are common in Prader-Willi syndrome (PWS), affecting expressive language skills. While phonology is generally good, morphosyntax, vocabulary, and pragmatics present challenges.

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Area of Science:

Linguistics
Genetics
Developmental Psychology

Background:

Prader-Willi syndrome (PWS) is a complex genetic disorder.
Language and communication deficits are recognized features of PWS.
The precise nature and prevalence of these language difficulties require further delineation.

Purpose of the Study:

To investigate the prevalence and characteristics of language impairments in individuals with Prader-Willi syndrome.
To identify specific linguistic levels most affected in PWS.

Main Methods:

Analysis of spontaneous speech samples from 32 Dutch-speaking individuals with PWS (ages 4.5–29.5).
Utilized TOAST, a standardized Dutch diagnostic instrument for spontaneous language production.
Employed consensus orthographic transcription for speech sample analysis.

Main Results:

Expressive language difficulties are prevalent in Prader-Willi syndrome.
Morphosyntax was generally found to be impaired, while phonology was relatively preserved.
Challenges in vocabulary and pragmatics were also observed, with significant inter-individual variability.

Conclusions:

Language difficulties in PWS are multifaceted, impacting various linguistic domains.
Morphosyntax appears particularly vulnerable in individuals with PWS.
Understanding these specific language profiles is crucial for targeted interventions in PWS.