Auditory Global-Local Processing Under Tonal Language Background: Effect of Attention and Autistic Traits.

Purpose: Neurotypical individuals show a robust "global precedence effect (GPE)" when processing hierarchically structured visual information. However, the auditory domain remains understudied. The current research serves to fill the knowledge gap on auditory global-local processing across the broader autism phenotype under the tonal language background.

Method: This study examined auditory global-local processing styles in 37 Mandarin-speaking young adults (age: = 20.35, = 2.32; 19 males) with varying autistic traits. The participants were required to judge global and local pitch structures in nine-tone melodies with both congruent and incongruent conditions under both directed attention and divided attention modes.

Results: We found that GPE persisted independent of the attention modes during hierarchical processing. Autistic traits were among the potential contributors that reshaped GPE in auditory global-local processing under a tonal language background.

Conclusions: Our study provides an initial investigation into auditory global-local processing among Mandarin-speaking individuals across a range of autistic traits, revealing the presence of the GPE effect during hierarchical pitch structure processing. The advantage of global processing versus local processing expanded with increasing autistic traits, providing further support for the notion that auditory global processing may remain intact in autism and the broader phenotype. We highlight that GPE is a process of coarse-to-fine integration of sensory perception and cognitive feedback iteration, which both top-down and bottom-up processes wield influence on. These findings have implications for the study of atypical auditory processing in autism and may help to refine the early diagnosis and auditory-based intervention for autism.

Supplemental Material: https://doi.org/10.23641/asha.28114118.