Neural substrates of sublexical processing for spelling

Andrew T. DeMarco, Stephen M. Wilson, Kindle Rising, Steven Z. Rapcsak, Pélagie M. Beeson

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

We used fMRI to examine the neural substrates of sublexical phoneme-grapheme conversion during spelling in a group of healthy young adults. Participants performed a writing-to-dictation task involving irregular words (e.g., choir), plausible nonwords (e.g., kroid), and a control task of drawing familiar geometric shapes (e.g., squares). Written production of both irregular words and nonwords engaged a left-hemisphere perisylvian network associated with reading/spelling and phonological processing skills. Effects of lexicality, manifested by increased activation during nonword relative to irregular word spelling, were noted in anterior perisylvian regions (posterior inferior frontal gyrus/operculum/precentral gyrus/insula), and in left ventral occipito-temporal cortex. In addition to enhanced neural responses within domain-specific components of the language network, the increased cognitive demands associated with spelling nonwords engaged domain-general frontoparietal cortical networks involved in selective attention and executive control. These results elucidate the neural substrates of sublexical processing during written language production and complement lesion-deficit correlation studies of phonological agraphia.

Original languageEnglish (US)
Pages (from-to)118-128
Number of pages11
JournalBrain and Language
Volume164
DOIs
StatePublished - Jan 1 2017

Keywords

  • Phonological agraphia
  • Phonological processing
  • Spelling
  • Sublexical processing
  • Writing
  • fMRI

ASJC Scopus subject areas

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

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