Auditory Global-Local Processing in Autism Spectrum Disorder: A Systematic Review and Meta-Analysis.

In 30 seconds

This systematic review and meta-analysis examined auditory global-local pitch processing in individuals with autism spectrum disorder (ASD) compared with typically developing peers. A search of four databases identified 25 studies for quantitative synthesis. The pooled effect for global pitch processing was not statistically significant (Hedges' g = -0.05), while local pitch processing showed a significant, modest effect (Hedges' g = 0.29). The authors report that task and participant factors, including vocabulary size, may help explain variation across studies. Overall, the findings suggest a tendency toward local processing without evidence of a global-processing deficit.

Key findings

• Global pitch processing showed no statistically significant pooled difference (Hedges' g = -0.05).
• Local pitch processing showed a significant, modest pooled effect (Hedges' g = 0.29).
• Global-processing results varied with answer-choice number, language typology, and participants' vocabulary size.
• Vocabulary size among autistic participants and task paradigm differences were associated with variation in local-processing outcomes.

Why it matters

The findings distinguish a possible local-processing preference from a broad impairment in global auditory processing. This may help clinicians and researchers interpret auditory task performance in ASD without assuming that global processing is uniformly deficient. The identified moderators also underscore that task design and participant characteristics can influence observed results.

What to keep in mind

The synthesis included only 25 studies, and the abstract reports heterogeneity in findings related to task paradigms and participant characteristics.