Narrative Skill in Boys with Fragile X Syndrome with and without Autism Spectrum Disorder

Area of Science:

• Neurodevelopmental disorders
• Developmental psychology
• Linguistics

Background:

• Fragile X syndrome (FXS) is a genetic disorder often co-occurring with autism spectrum disorder (ASD).
• Narrative recall is a complex cognitive skill involving memory, language, and executive functions.
• Understanding narrative abilities in neurodevelopmental disorders is crucial for targeted interventions.

Purpose of the Study:

• To compare narrative recall abilities in boys with FXS-ASD, FXS without ASD, Down syndrome (DS), and typically developing (TD) boys.
• To identify factors predicting narrative recall, including cognitive and linguistic variables.
• To determine the specific impact of ASD on narrative recall in the context of FXS.

Main Methods:

• Recalled narratives from four groups of boys (FXS-ASD, FXS-O, DS, TD) were analyzed.
• Narratives were scored for macrostructural Story Grammar elements (Introduction, Relationship, Initiating Events, Internal Response, Attempts/Actions, Ending).
• Statistical analyses adjusted for covariates like short-term memory and nonverbal mental age.

Main Results:

• Short-term memory and nonverbal mental age predicted narrative recall across most groups.
• No significant differences in narrative recall were found between FXS-O, FXS-ASD, and DS groups after covariate adjustment.
• The FXS-ASD group performed significantly worse than the TD group on overall Story Grammar, and both FXS groups showed lower "Attempts/Actions" scores than the TD group.

Conclusions:

• Narrative impairment may be associated with FXS and potentially other forms of intellectual disability (ID).
• The presence of ASD exacerbates narrative recall deficits in boys with FXS.
• Cognitive factors like memory and nonverbal mental age are key predictors of narrative recall in these populations.