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Cortical auditory processing and communication in children with autism: electrophysiological/behavioral relations.

Nicole Bruneau1, Frédérique Bonnet-Brilhault, Marie Gomot

  • 1Service Universitaire d'Explorations Fonctionnelles, et de Neurophysiologie en Pédopsychiatrie, 2, Bd Tonnellé, 37 044, Tours, France. n.bruneau@chu-tours.fr

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|November 25, 2003
PubMed
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Children with autism show altered auditory evoked potentials (AEPs), with right-sided temporal N1c responses correlating with better communication skills. This suggests right-hemisphere functional reorganization in autism.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Clinical Audiology

Background:

  • Autism Spectrum Disorder (ASD) is characterized by social communication deficits.
  • Auditory evoked potentials (AEPs) offer insights into auditory processing in children.
  • Previous research indicates atypical auditory processing in autism.

Purpose of the Study:

  • To investigate the relationship between late auditory evoked potentials (AEPs), specifically the N1c wave (Tb), and verbal/non-verbal abilities in children with autism.
  • To compare AEPs in children with autism to those in typically developing children.
  • To explore electro-clinical correlations between temporal AEPs and communication severity in autism.

Main Methods:

  • Recorded late auditory evoked potentials (AEPs) at temporal sites in 26 children with autism (aged 4-8 years) and 16 typically developing children.

Related Experiment Videos

  • Used 750 Hz tone bursts at varying intensity levels (50-80 dB SPL) as auditory stimuli.
  • Assessed verbal and non-verbal abilities and communication severity using developmental quotients and a behavior rating scale.

    • Main Results:

    • AEPs (N1c wave) had smaller amplitudes in children with autism compared to controls.
    • Autism group showed an intensity-related amplitude increase only on the right side, unlike controls.
    • A significant asymmetry was observed at 80 dB SPL, with greater right-sided N1c amplitude in autism.
    • Higher right temporal N1c amplitude correlated positively with better verbal and non-verbal communication abilities in children with autism.

    Conclusions:

    • Children with autism exhibit altered auditory processing, evidenced by reduced and asymmetrical temporal AEPs.
    • Findings suggest a right-hemisphere functional reorganization for auditory processing in autism.
    • Preferential right-hemisphere activation may compensate for atypical left-hemisphere function in secondary auditory areas.