Neural responses to grammatically and lexically degraded speech

Alexa Bautista, Stephen M. Wilson

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

ABSTRACT: Linguistic stimuli that are degraded in various ways have been used in neuroimaging studies to uncover distinct roles in language processing for different brain regions. To identify regions differentially involved in grammatical and lexical processing, we spectrally rotated specific morphemes and manipulated morpheme order to create speech stimuli that were degraded either grammatically or lexically, yet were matched in intelligibility. Twelve participants were scanned with functional magnetic resonance imaging (fMRI) as they listened to the grammatically and lexically degraded stimuli, interspersed with clear stimuli in the context of a familiar narrative. Contrary to our expectations, we did not find any brain regions that were selectively sensitive to grammatical or lexical degradation. However, there was less signal reduction than anticipated in response to degradation of either type. These findings may reflect increased attention to the degraded stimuli due to the narrative context, attenuating the signal decreases typically associated with reduced intelligibility.

Original languageEnglish (US)
Pages (from-to)567-574
Number of pages8
JournalLanguage, Cognition and Neuroscience
Volume31
Issue number4
DOIs
StatePublished - Apr 20 2016

Keywords

  • Language comprehension
  • degraded speech
  • fMRI
  • intelligibility
  • narrative

ASJC Scopus subject areas

  • Language and Linguistics
  • Experimental and Cognitive Psychology
  • Linguistics and Language
  • Cognitive Neuroscience

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