Auditory sensory processing in autism: A magnetoencephalographic study

Franca Tecchio*, Francesca Benassi, Filippo Zappasodi, Leonardo Emberti Gialloreti, Mark Palermo, Stefano Seri, Paolo Maria Rossini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Background: Patients with autism show clinical features suggestive of abnormal processing of auditory and other sensory information. We hypothesized that low-functioning autistic subjects present abnormalities in discriminating simple auditory stimuli at sensory system preconscious stages of cortical processing. Methods: To verify our hypothesis, we used magnetoencephalographic measurements of mismatch field (MMF), which reflects the detection of a change in the physical characteristics of a repetitive sound. Fourteen patients (aged 8-32 years) who met DSM-IV diagnostic criteria for autistic disorder participated in an auditory oddball experiment. Ten healthy participants matched for age and gender acted as control subjects. Results: Significant differences in cerebral responses between patients and control subjects were recorded. Whereas control subjects showed a clearly identifiable MMF, with distinct generators in the M100 brain wave with regard to latency, position, and strength, no identifiable MMF was present in the autistic group. Conclusions: Our findings suggest that low-functioning autistic subjects present a dysfunction at preconscious stages of cortical auditory discrimination, playing a role in the abnormal processing of auditory sensory afferences. The attention independence of the MMF allows for exclusion of an effect related to impaired attention or task-related responses.

Original languageEnglish
Pages (from-to)647-654
Number of pages8
JournalBiological Psychiatry
Issue number6
Publication statusPublished - 15 Sept 2003


  • Autism
  • Automatic neural mismatch
  • Cortical discrimination ability
  • Magnetoencephalography
  • Mismatch field
  • Sensory impairment


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