Executive functions in children with autism spectrum disorders

Area of Science:

• Neurodevelopmental Disorders
• Cognitive Psychology
• Child Psychology

Background:

• Executive dysfunction is a hallmark of Autism Spectrum Disorders (ASD).
• The relationship between these deficits and intellectual disability in ASD remains unclear.
• Understanding executive functions in ASD is crucial for targeted interventions.

Purpose of the Study:

• To investigate executive function profiles in children with ASD (IQ ≥ 70) compared to typically developing controls.
• To determine if executive function deficits in ASD are independent of IQ and verbal ability.
• To explore age-related patterns in executive function performance in ASD.

Main Methods:

• A group of 54 children with ASD and an age-, gender-, IQ-, and vocabulary-matched control group were assessed.
• Executive functions were evaluated using tasks measuring inhibition (Stroop, Junior Hayling Test), planning (Tower of London), mental flexibility (Wisconsin Card Sorting Task), and generativity (Verbal Fluency).
• Performance was analyzed for group differences and age-related trends.

Main Results:

• Children with ASD exhibited significant impairments in response inhibition and planning.
• Performance in mental flexibility and verbal fluency was preserved in the ASD group.
• Atypical age-related patterns were observed in response inhibition and self-monitoring for children with ASD.

Conclusions:

• Executive function deficits in planning, response inhibition, and self-monitoring are characteristic of ASD, independent of IQ and verbal ability.
• These executive function difficulties appear relatively stable across childhood in individuals with ASD.
• A multidimensional model of executive functions is proposed for understanding ASD.