Sensorimotor Gating Deficits in Adults with Autism

William Perry, Arpi Minassian, Brian Lopez, Leeza Maron, Alan Lincoln

Research output: Contribution to journalArticle

238 Scopus citations

Abstract

Background: Prepulse inhibition (PPI) is an operational measure of sensorimotor gating and is impaired in a family of neuropsychiatric disorders characterized by abnormalities of inhibitory function. Adults with autistic disorder (AD) exhibit clinical features of inhibitory deficits, such as restrictive and repetitive behaviors, that may be explained by deficits in sensorimotor gating. Methods: Acoustic startle reactivity, habituation, and PPI (30-, 60-, 120-msec interstimulus intervals) were assessed in 14 adult men diagnosed with AD and 16 typically developing normal comparison (NC) participants. All participants were administered measures of intelligence and frontal-executive functioning. Results: Adults with AD exhibited significantly less PPI in the 60-msec condition than NC participants, which was correlated with increased ratings of restricted and repetitive behaviors. The groups did not differ on measures of startle amplitude or overall habituation. There was, however, a significant group-by-block habituation effect. Furthermore, PPI was not related to intelligence but was moderately associated with performance on a measure of frontal-executive functioning. Conclusions: Adults with AD have sensorimotor gating deficits similar to other neurodevelopmental disorders, implicating a failure of normal inhibitory regulation of sensory, motor, and attentional mechanisms. Thus, PPI deficits may be indirectly linked to one of the hallmark features of AD.

Original languageEnglish (US)
Pages (from-to)482-486
Number of pages5
JournalBiological Psychiatry
Volume61
Issue number4
DOIs
StatePublished - Feb 15 2007

Keywords

  • Autistic disorder
  • executive functioning
  • fluency
  • prepulse inhibition
  • sensorimotor gating
  • startle

ASJC Scopus subject areas

  • Biological Psychiatry

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