Atypical delayed auditory feedback effect and lombard effect on speech production in high-functioning adults with autism spectrum disorder

I. Fan Lin, Takemi Mochida, Kosuke Asada, Satsuki Ayaya, Shin Ichiro Kumagaya, Masaharu Kato

Research output: Contribution to journalArticle

6 Citations (Scopus)


Individuals with autism spectrum disorder (ASD) show impaired social interaction and communication, which may be related to their difficulties in speech production. To investigate the mechanisms of atypical speech production in this population, we examined feedback control by delaying the auditory feedback of their own speech, which degraded speech fluency. We also examined feedforward control by adding loud pink noise to the auditory feedback, which led to increased vocal effort in producing speech. The results of Japanese speakers show that, compared with neurotypical (NT) individuals, high-functioning adults with ASD (including Asperger's disorder, autistic disorder, and pervasive developmental disorder not otherwise specified) were more affected by delayed auditory feedback but less affected by external noise. These findings indicate that, in contrast to NT individuals, those with ASD relied more on feedback control than on feedforward control in speech production, which is consistent with the hypothesis that this population exhibits attenuated Bayesian priors.

Original languageEnglish
Article number510
JournalFrontiers in Human Neuroscience
Issue numberSeptember
Publication statusPublished - Sep 22 2015
Externally publishedYes



  • Audio-motor coordination
  • Autism
  • Delayed auditory feedback
  • Feedback control
  • Feedforward control
  • Lombard effect
  • Speech production

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Neurology
  • Psychiatry and Mental health
  • Biological Psychiatry
  • Behavioral Neuroscience

Cite this