Word and letter string processing networks in schizophrenia: Evidence for anomalies and compensation

Autor(en): Griego, Jacqueline A.
Cortes, Carlos R.
Nune, Sunitha
Fisher, Joscelyn E.
Tagamets, M. -A.
Stichwörter: Audiology & Speech-Language Pathology; AUDITORY HALLUCINATIONS; Effective connectivity; FMRI; FRONTOTEMPORAL CONNECTIVITY; FUNCTIONAL CONNECTIVITY; HUMAN BRAIN; Imaging; INFERIOR PREFRONTAL CORTEX; LANGUAGE; Lateralization; Lexical-semantic processing; Linguistics; METAANALYSIS; Modeling; Neurosciences; Neurosciences & Neurology; Psychology; Psychology, Experimental; Schizophrenia and language; THOUGHT-DISORDER; WORKING-MEMORY
Erscheinungsdatum: 2008
Herausgeber: ACADEMIC PRESS INC ELSEVIER SCIENCE
Journal: BRAIN AND LANGUAGE
Volumen: 107
Ausgabe: 2
Startseite: 158
Seitenende: 166
Zusammenfassung: 
Imaging Studies show that in normal language correlated activity between anterior and posterior brain regions increases as the linguistic and semantic content (i.e., from false fonts, letter strings, pseudo words, to words) of stimuli increase. In schizophrenia however, disrupted functional connectivity between frontal and posterior brain regions has been frequently reported and these disruptions may change the nature of language organization. We characterized basic linguistic operations in word and letter string processing in a region-of-interest network using structural equation modeling (SEM). Healthy volunteers and volunteers with schizophrenia performed ail fMRI one-back matching task with real words and consonant letter strings. We hypothesized that left hemisphere network dysfunction in schizophrenia would be present during processes dealing with linguistic/semantic content. The modeling results suggest aberrant left hemisphere function in schizophrenia, even in tasks requiring, minimal access to language. Alternative mechanisms included increases in right hemisphere involvement and increased top-down influence from frontal to posterior regions. (C) 2008 Elsevier Inc. All rights reserved.
ISSN: 0093934X
DOI: 10.1016/j.bandl.2008.04.001

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