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Related Experiment Video

Updated: Jun 5, 2026

Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder

Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder

Published on: April 22, 2015

Atypical processing of auditory temporal complexity in autistics.

Fabienne Samson¹, Krista L Hyde, Armando Bertone

¹Centre d'Excellence en Troubles Envahissants du Développement de l'Université de Montréal (CETEDUM), Montréal, QC, Canada.

Neuropsychologia

|January 4, 2011

Summary

Autistic individuals show different brain activity when processing complex sounds. Their auditory cortex responds more to basic sound features, potentially impacting speech perception.

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Area of Science:

Neuroscience
Auditory Processing
Autism Spectrum Disorder

Background:

Autism is characterized by varied auditory behaviors, including enhanced pitch processing and reduced attention to complex speech sounds.
A visual processing dissociation suggests atypical auditory cortex activity may underlie these differences in autistic individuals.

Purpose of the Study:

To investigate the neural basis of complex non-social sound processing in autistic and non-autistic individuals using functional magnetic resonance imaging (fMRI).
To explore how spectral and temporal complexity in auditory stimuli affect brain activity in different auditory cortex regions.

Main Methods:

fMRI scans were conducted on 15 autistic and 13 non-autistic participants performing a sound detection task.
Auditory stimuli varied in spectral complexity (harmonic content) and temporal complexity (frequency modulation depth).
Brain activity was analyzed in primary (Heschl's gyrus) and non-primary (superior temporal gyrus) auditory cortex.

Main Results:

Both groups showed increased activity in primary and non-primary auditory cortex with increasing sound complexity.
Autistic individuals exhibited diminished activity in non-primary auditory cortex and increased activity in primary auditory cortex for temporally complex sounds.
Activity patterns differed between groups, with autistics showing greater effects in acoustic feature-sensitive regions and reduced effects in abstract feature-sensitive regions.

Conclusions:

Auditory processing in autism shows a similar hierarchical organization but with distinct neural activity patterns.
Autistic individuals may focus more on perceptual acoustic features rather than abstract sound features, potentially influencing speech sound processing.