A multimodal mapping study of conduction aphasia with impaired repetition and spared reading aloud

Barbara Tomasino, Dario Marin, Marta Maieron, Serena D'Agostini, Irene Medeossi, Franco Fabbro, Miran Skrap, Claudio Luzzatti

Research output: Contribution to journalArticle

Abstract

The present study explores the functional neuroanatomy of the phonological production system in an Italian aphasic patient (SP) who developed conduction aphasia of the reproduction type following brain surgery. SP presented with two peculiar features: (1) his lesion was localized in the superior temporal gyrus, just posterior to the primary auditory cortex and anterior/inferior to and neighboring the Sylvian parietal temporal (Spt) area, and (2) he presented with severely impaired repetition and spelling from dictation of words and pseudowords but spared reading-aloud of words and pseudowords.Structural, functional, fiber tracking and intraoperative findings were combined to analyze SP's pattern of performance within a widely used sensorimotor control scheme of speech production.We found a dissociation between an interrupted sector of the arcuate fasciculus terminating in STG, known to be involved in phonological processing, and a part of the arcuate fasciculus terminating in MTG, which is held to be involved in lexical-semantic processing. We argue that this phonological deficit should be interpreted as a disorder of the feedback system, in particular of the auditory and somatosensory target maps, which are assumed to be located along the Spt area. In patient SP, the spared part of the left arcuate fasciculus originating in MTG may support an unimpaired reading performance, while the damaged part of the left arcuate fasciculus originating in STG may be responsible for his impaired repetition and spelling from dictation.

Original languageEnglish
Pages (from-to)214-226
Number of pages13
JournalNeuropsychologia
Volume70
DOIs
Publication statusPublished - Apr 1 2015

Keywords

  • Conduction aphasia
  • Magnetic resonance imaging (MRI)
  • Phonological processing
  • Reading and writing
  • Superior temporal gyrus (STG)
  • Sylvian parietal temporal (Spt) area

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Cognitive Neuroscience
  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)
  • Medicine(all)

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