Brain functional differences during irony comprehension in adolescents with ASD.

Area of Science:

• Neuroscience
• Developmental Psychology
• Linguistics

Background:

• Irony comprehension is a complex cognitive process.
• Difficulties in understanding irony are observed in individuals with autism spectrum disorder (ASD) and poor comprehenders (PCs).
• Understanding the underlying neurocognitive mechanisms is crucial for targeted interventions.

Purpose of the Study:

• To investigate the common and specific neurocognitive mechanisms underlying irony comprehension deficits in adolescents with ASD and PCs.
• To compare the performance of ASD and PC groups with a typical developing (TD) control group.
• To identify distinct neural correlates associated with irony comprehension in these populations.

Main Methods:

• Neuroimaging (fMRI) was used to examine brain activation patterns during irony comprehension tasks.
• Behavioral assessments measured irony comprehension, theory of mind (ToM), and structural language skills.
• Participants included adolescents with ASD, PCs, and age-matched TD controls.

Main Results:

• Both ASD and PC groups exhibited lower irony comprehension than TD controls.
• ASD group showed reduced left inferior frontal gyrus (IFG) activation, correlated with ToM deficits.
• PC group displayed reduced right cuneus activation, linked to language comprehension scores, and differential medial prefrontal cortex (mPFC) activation compared to ASD and TD groups.

Conclusions:

• Impaired irony comprehension in ASD is associated with deficits in theory of mind and distinct neural activation in the IFG and mPFC.
• Language comprehension deficits contribute to poor irony comprehension in PCs, with unique neural correlates in the cuneus.
• Findings highlight distinct neurocognitive pathways for irony comprehension difficulties in ASD and PCs.