Two Distinct Auditory-Motor Circuits for Monitoring Speech Production as Revealed by Content-Specific Suppression of Auditory Cortex

Research output: Contribution to journalArticle

Abstract

Speech production, both overt and covert, down-regulates the activation of auditory cortex. This is thought to be due to forward prediction of the sensory consequences of speech, contributing to a feedback control mechanism for speech production. Critically, however, these regulatory effects should be specific to speech content to enable accurate speech monitoring. To determine the extent to which such forward prediction is content-specific, we recorded the brain's neuromagnetic responses to heard multisyllabic pseudowords during covert rehearsal in working memory, contrasted with a control task. The cortical auditory processing of target syllables was significantly suppressed during rehearsal compared with control, but only when they matched the rehearsed items. This critical specificity to speech content enables accurate speech monitoring by forward prediction, as proposed by current models of speech production. The one-to-one phonological motor-to-auditory mappings also appear to serve the maintenance of information in phonological working memory. Further findings of right-hemispheric suppression in the case of whole-item matches and left-hemispheric enhancement for last-syllable mismatches suggest that speech production is monitored by 2 auditory-motor circuits operating on different timescales: Finer grain in the left versus coarser grain in the right hemisphere. Taken together, our findings provide hemisphere-specific evidence of the interface between inner and heard speech.

Details

Authors
  • Sari Ylinen
  • Anni Nora
  • Alina Leminen
  • Tero Hakala
  • Minna Huotilainen
  • Yury Shtyrov
  • Jyrki P. Makela
  • Elisabet Service
Organisations
External organisations
  • Aarhus University
  • University of Cambridge
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Neurosciences
  • General Language Studies and Linguistics

Keywords

  • asymmetric speech monitoring, efference copy, forward prediction, magnetoencephalography (MEG), phonological working memory
Original languageEnglish
Pages (from-to)1576-1586
JournalCerebral Cortex
Volume25
Issue number6
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Linguistics and Phonetics (015010003)