Epileptiform Abnormalities Linked to Lower Cognitive Performance in Autism Spectrum Disorder

A monocentric retrospective study published in the Journal of Autism and Developmental Disorders highlights the potential influence of epileptiform abnormalities (EAs) and epilepsy on the functional phenotype of individuals with Autism Spectrum Disorder (ASD). Research indicates that the presence of both epilepsy and EAs within the ASD cohort is associated with significantly lower cognitive performance compared to individuals diagnosed with ASD alone or those with ASD and EAs but without epilepsy. This finding suggests that the presence of epileptiform activity may play a critical role in shaping the cognitive and behavioral outcomes in this complex neurodevelopmental condition.

Autism Spectrum Disorder and epilepsy frequently occur together, leading researchers to hypothesize that shared neurobiological underpinnings might be involved in the co-occurrence of these conditions. While no specific seizure type or epilepsy syndrome has been consistently linked to ASD, EAs are commonly observed in affected individuals. However, the clinical significance of these abnormalities has remained unclear until this study was conducted. The research team examined the impact of EAs and epilepsy on the functional phenotype of a cohort of 338 individuals with ASD. The study employed a combination of sophisticated diagnostic and assessment tools, including video-EEG (v-EEG) to capture epileptiform activity, alongside standardized psychometric tools such as the Autism Diagnostic Observation Scale, Second Edition (ADOS-2), Leiter-R, Wechsler Intelligence Scale for Children (WISC-IV), and Vineland Adaptive Behavior Scales (VABS).

The results of the investigation provided specific insights into the functional profiles of the participants. The data demonstrated that ASD individuals who exhibited epilepsy showed significantly lower cognitive performance when compared to those with ASD alone or those with ASD and EAs. Furthermore, the group characterized by ASD plus EAs displayed greater overall symptom severity. Interestingly, despite these findings regarding cognition and symptom severity, the study reported that no significant differences emerged in the areas of adaptive functioning or language abilities across the different groups examined.

These results underscore the potential influence of epileptiform activity on both the cognitive and behavioral outcomes observed in ASD. The study suggests that the presence of EAs may be a contributing factor to cognitive challenges within the ASD population. Given these observations, the researchers conclude that further longitudinal research is warranted. Such studies are necessary to better elucidate the prognostic implications of EAs in ASD and to more accurately characterize the impact of these abnormalities on the overall functional profile of affected individuals.

Subject of Research: The impact of epileptiform abnormalities and epilepsy on the cognitive and behavioral phenotype of individuals with Autism Spectrum Disorder.

Article Title: Impact of Epileptiform Abnormalities on Functional Phenotype in a Cohort of Autism Spectrum Disorder Patients With or Without Epilepsy: A Monocentric Retrospective Study

Article References: Garotti, R., Aiello, S., Riccio, M. P., Pezone, M., Fiorile, A. M. F., Marani, N., Bravaccio, C., & Terrone, G. (2026). Impact of Epileptiform Abnormalities on Functional Phenotype in a Cohort of Autism Spectrum Disorder Patients With or Without Epilepsy: A Monocentric Retrospective Study. Journal of Autism and Developmental Disorders. https://doi.org/10.1007/s10803-026-07584-x

Image Credits: AI Generated

DOI: 10.1007/s10803-026-07584-x

Keywords: Autism Spectrum Disorder, Epilepsy, Epileptiform Abnormalities, Cognitive Performance, Neurodevelopmental Disorders, Video-EEG, Psychometrics, Functional Phenotype, Impact, Epileptiform, Abnormalities, Functional