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Applied Psychophysiology and Biofeedback

, Volume 34, Issue 1, pp 37–51 | Cite as

Event-related Potential Study of Novelty Processing Abnormalities in Autism

  • Estate Sokhadze
  • Joshua Baruth
  • Allan Tasman
  • Lonnie Sears
  • Grace Mathai
  • Ayman El-Baz
  • Manuel F. Casanova
Article

Abstract

To better understand visual processing abnormalities in autism we studied the attention orienting related frontal event potentials (ERP) and the sustained attention related centro-parietal ERPs in a three stimulus oddball experiment. The three stimulus oddball paradigm was aimed to test the hypothesis that individuals with autism abnormally orient their attention to novel distracters as compared to controls. A dense-array 128 channel EGI electroencephalographic (EEG) system was used on 11 high-functioning children and young adults with autism spectrum disorder (ASD) and 11 age-matched, typically developing control subjects. Patients with ASD showed slower reaction times but did not differ in response accuracy. At the anterior (frontal) topography the ASD group showed significantly higher amplitudes and longer latencies of early ERP components (e.g., P100, N100) to novel distracter stimuli in both hemispheres. The ASD group also showed prolonged latencies of late ERP components (e.g., P2a, N200, P3a) to novel distracter stimuli in both hemispheres. However, differences were more profound in the right hemisphere for both early and late ERP components. Our results indicate augmented and prolonged early frontal potentials and a delayed P3a component to novel stimuli, which suggest low selectivity in pre-processing and later-stage under-activation of integrative regions in the prefrontal cortices. Also, at the posterior (centro-parietal) topography the ASD group showed significantly prolonged N100 latencies and reduced amplitudes of the N2b component to target stimuli. In addition, the latency of the P3b component was prolonged to novel distracters in the ASD group. In general, the autistic group showed prolonged latencies to novel stimuli especially in the right hemisphere. These results suggest that individuals with autism over-process information needed for the successful differentiation of target and novel stimuli. We propose the potential application of ERP evaluations in a novelty task as outcome measurements in the biobehavioral treatment (e.g., EEG biofeedback, TMS) of autism.

Keywords

Event-related potentials Autism Attention Novelty 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Estate Sokhadze
    • 1
  • Joshua Baruth
    • 1
    • 3
  • Allan Tasman
    • 1
  • Lonnie Sears
    • 2
  • Grace Mathai
    • 2
  • Ayman El-Baz
    • 1
  • Manuel F. Casanova
    • 1
    • 3
  1. 1.Department of Psychiatry and Behavioral ScienceUniversity of Louisville School of MedicineLouisvilleUSA
  2. 2.Department of PediatricsUniversity of Louisville School of MedicineLouisvilleUSA
  3. 3.Department of Anatomical Sciences and NeurobiologyUniversity of Louisville School of MedicineLouisvilleUSA

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