Written Expression in Individuals with Autism Spectrum Disorder: A Meta-Analysis

Area of Science:

• Developmental Psychology
• Neurodevelopmental Disorders
• Educational Psychology

Background:

• Limited research exists on the specific writing skills of individuals with autism spectrum disorder (ASD).
• Existing studies often focus on interventions rather than foundational writing abilities.
• Understanding these differences is crucial for targeted educational support.

Purpose of the Study:

• To identify and compare specific written expression components between individuals with ASD and typically developing (TD) peers.
• To examine the relationship between research quality and effect size in studies on ASD writing skills.
• To highlight areas needing further investigation in the writing characteristics of individuals with ASD.

Main Methods:

• Systematic review and meta-analysis of 13 studies on written expression in ASD.
• Comparison of variables including length, legibility, handwriting, speed, spelling, and structure.
• Pearson Product Moment-correlation used to assess research quality and effect size relationship.

Main Results:

• Significant differences were found in multiple written expression components between individuals with ASD and TD peers.
• Key areas of difference include text length, legibility, handwriting size and speed, spelling accuracy, and overall organization.
• A correlation analysis was performed to link study quality with the magnitude of observed effects.

Conclusions:

• Individuals with ASD exhibit unique patterns in written expression compared to TD individuals.
• These findings underscore the need for specialized writing instruction and support tailored to ASD.
• Future research should explore whether these writing characteristics align with those of other student populations experiencing writing difficulties.