Developmental Language Differences in Children with Autism Spectrum Disorders and Possible Sex Difference

Area of Science:

• Neurodevelopmental disorders
• Developmental psychology
• Speech and language pathology

Background:

• Autism spectrum disorder (ASD) is characterized by developmental differences, with sex-based variations not fully understood.
• Language acquisition is a key area of development affected in ASD.
• Previous research indicates potential sex differences in ASD symptom presentation.

Purpose of the Study:

• To investigate the specific sequence of developmental language milestone acquisition in children with ASD.
• To identify potential sex differences in language development within the ASD population.
• To compare the language development trajectory in ASD with typical developmental sequences.

Main Methods:

• Utilized Mokken scale analysis, a nonparametric item response theory model.
• Analyzed language profiles of 610 children diagnosed with ASD, aged 2-7 years.
• Examined the order of acquisition for expressive and receptive language milestones, including gestures and pragmatics.

Main Results:

• Children with ASD exhibited atypical sequences in both expressive and receptive language development compared to typical patterns.
• The female subgroup showed more significant impairments in acquiring gestures and pragmatic language skills than the male subgroup.
• Significant differences in developmental language sequences were observed between sexes within the ASD group.

Conclusions:

• The study identified a unique developmental language sequence for children with ASD.
• Sex differences in language acquisition, particularly in gestural and pragmatic domains, are evident in ASD.
• This detailed developmental language profile can enhance the understanding and assessment of ASD.