Reduced habituation of auditory evoked potentials indicate cortical hyper-excitability in Fragile X Syndrome

L. E. Ethridge, S. P. White, M. W. Mosconi, J. Wang, M. J. Byerly, J. A. Sweeney

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

Sensory hypersensitivities are common, clinically distressing features of Fragile X Syndrome (FXS). Preclinical evidence suggests this abnormality may result from synaptic hyper-excitability in sensory systems. This model predicts reduced sensory habituation to repeated stimulus presentation. Fourteen adolescents and adults with FXS and 15 age-matched controls participated in a modified auditory gating task using trains of 4 identical tones during dense array electroencephalography (EEG). Event-related potential and single trial time-frequency analyses revealed decreased habituation of the N1 event-related potential response in FXS, and increased gamma power coupled with decreases in gamma phase-locking during the early-stimulus registration period. EEG abnormalities in FXS were associated with parent reports of heightened sensory sensitivities and social communication deficits. Reduced habituation and altered gamma power and phase-locking to auditory cues demonstrated here in FXS patients parallels preclinical findings with Fmr1 KO mice. Thus, the EEG abnormalities seen in FXS patients support the model of neocortical hyper-excitability in FXS, and may provide useful translational biomarkers for evaluating novel treatment strategies targeting its neural substrate.

Original languageEnglish (US)
Pages (from-to)e787
JournalTranslational Psychiatry
Volume6
DOIs
StatePublished - Apr 19 2016

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Psychiatry and Mental health
  • Biological Psychiatry

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