Epilepsy and EEG paroxysmal abnormalities in autism spectrum disorders

Antonia Parmeggiani, Giulia Barcia, Annio Posar, Elena Raimondi, Margherita Santucci, Maria Cristina Scaduto

Research output: Contribution to journalArticlepeer-review


The occurrence of epilepsy in autism is variable; nevertheless, EEG paroxysmal abnormalities (PA) are frequently recorded in patients with autism, although the influence of epilepsy and/or EEG PA on the autistic regression has not been clarified yet. We examine a large sample of 345 inpatients with autism, divided into three groups: (1) patients without epilepsy and EEG PA; (2) patients with EEG PA but no seizures; (3) patients with epilepsy including febrile convulsions. The prevalence of epilepsy (24.9%) and EEG PA (45.5%) was higher than that reported in the general population. The significant differences among the three groups concerned autistic regression (comparison between groups 1 and 2, p<0.05; comparison between groups 1 and 3, p<0.01), cerebral lesions (comparison between groups 1 and 2, p<0.05; between groups 1 and 3, p<0.001), and symptomatic autism (comparison between groups 1 and 2 as much as comparison between groups 1 and 3, p<0.001), which were prevalent in groups 2 and 3; while severe/profound mental retardation was more frequent in group 3 compared to group 1 (p<0.01). Focal epilepsy (43.0%) and febrile convulsions (33.7%) were frequent in the third group with epilepsy. EEG PA were mainly localized in temporal and central areas (31.4%). Only 2.6% of patients had subcontinuous/continuous EEG PA during sleep. Seizures and EEG PA were not related to autistic regression. EEG PA occurred mainly in childhood, while epilepsy tended to occur (p<0.001) as age increased. The age at onset of seizures had two peaks: between 0 and 5 and between 10 and 15. years with no difference between idiopathic and symptomatic cases. In 58.5% of subjects aged ≥20. years, epilepsy including febrile seizures occurred at some point of their lives, while cases with only EEG PA were less frequent (9.7%). The relationship among autism, EEG PA and epilepsy should be clarified and investigated. In autism, seizures and EEG PA could represent an epiphenomenon of a cerebral dysfunction independent of apparent lesions.

Original languageEnglish
Pages (from-to)783-789
Number of pages7
JournalBrain and Development
Issue number9
Publication statusPublished - Oct 2010


  • Autism
  • Autism spectrum disorders
  • Autistic regression
  • EEG paroxysmal abnormalities
  • Epilepsy
  • Seizures

ASJC Scopus subject areas

  • Clinical Neurology
  • Developmental Neuroscience
  • Pediatrics, Perinatology, and Child Health


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