Memory in language-impaired children with and without autism

Area of Science:

• Developmental Psychology
• Neuroscience
• Linguistics

Background:

• Autism Spectrum Disorder (ASD) can involve significant language impairments, though not core symptoms.
• Specific Language Impairment (SLI) shares language deficits with some children with ASD.
• Investigating language phenotypes in ASD and SLI is crucial for understanding potential overlaps and differences.

Purpose of the Study:

• To compare memory abilities, particularly markers of heritable SLI, in young children.
• To examine differences among children with SLI, ASD with language impairment (ALI), and ASD with normal language (ALN).
• To explore the relationship between memory and language impairments in children with ASD.

Main Methods:

• Cross-sectional study involving 5-8 year old children in three groups: SLI (n=18), ALI (n=22), ALN (n=20).
• Administered a battery of cognitive, language, and ASD assessments.
• Included nonword repetition (NWR), verbal memory, visual memory, and processing speed measures.

Main Results:

• Nonword repetition (NWR) difficulties were more severe in SLI than ALI, especially with shorter nonwords.
• Verbal memory deficits were observed in both SLI and ALI groups compared to ALN.
• Verbal memory, not visual memory or processing speed, correlated with language impairment severity in children with ASD.

Conclusions:

• The primary distinction between SLI and ALI lies in nonword repetition (NWR) performance.
• Differences in NWR, particularly with multi-syllable nonwords, suggest distinct underlying mechanisms for language learning difficulties.
• Verbal memory impairments play a significant role in language difficulties among early school-aged children with ASD.