Brain regions recruited for the effortful comprehension of noise-vocoded words
2012 (English)In: Language and cognitive processes (Print), ISSN 0169-0965, E-ISSN 1464-0732, Vol. 27, no 7-8, 1145-1166 p.Article in journal (Refereed) Published
We used functional magnetic resonance imaging (fMRI) to investigate the neural basis of comprehension and perceptual learning of artificially degraded [noise vocoded (NV)] speech. Fifteen participants were scanned while listening to 6-channel vocoded words, which are difficult for naïve listeners to comprehend, but can be readily learned with appropriate feedback presentations. During three test blocks, we compared responses to potentially intelligible NV words, incomprehensible distorted words and clear speech. Training sessions were interleaved with the test sessions and included paired presentation of clear then noise-vocoded words: a type of feedback that enhances perceptual learning. Listeners' comprehension of NV words improved significantly as a consequence of training. Listening to NV compared to clear speech activated left insula, and prefrontal and motor cortices. These areas, which are implicated in speech production, may play an active role in supporting the comprehension of degraded speech. Elevated activation in the precentral gyrus during paired clear-then-distorted presentations that enhance learning further suggests a role for articulatory representations of speech in perceptual learning of degraded speech.
Place, publisher, year, edition, pages
Taylor & Francis, 2012. Vol. 27, no 7-8, 1145-1166 p.
IdentifiersURN: urn:nbn:se:liu:diva-78191DOI: 10.1080/01690965.2012.662280OAI: oai:DiVA.org:liu-78191DiVA: diva2:531670
The title of this article was Motor regions are recruited for effortful comprehension of noise-vocoded words: Evidence from fMRI when sent in as Manuscript.2012-06-072012-06-072015-04-16Bibliographically approved