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We correlated brain hypometabolism, measured with 18fluoro-deoxy-glucose positron emission tomography, with semantic and formal errors, as well as nonwords deriving from phonological errors produced in a picture-naming test by 63 patients with AD. Findings suggest that neurodegeneration leads to: (1) phonemic errors, by interfering with phonological short-term memory, or with control over retrieval of phonological or prearticulatory representations, within the left supramarginal gyrus; (2) semantic errors, by disrupting general semantic or visual-semantic representations at the level of the left posterior middle and inferior occipitotemporal cortex, respectively; (3) formal errors, by damaging the lexical\u2013phonological output interface in the left mid\u2013anterior segment of middle and superior temporal gyri. This topography of semantic\u2013lexical\u2013phonological steps of naming is in substantial agreement with dual-stream neurocognitive models of word generation.<\/jats:p>","DOI":"10.1177\/1533317520922390","type":"journal-article","created":{"date-parts":[[2020,5,1]],"date-time":"2020-05-01T05:34:06Z","timestamp":1588311246000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":8,"title":["A Metabolic Imaging Study of Lexical and Phonological Naming Errors in Alzheimer Disease"],"prefix":"10.1177","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1850-1236","authenticated-orcid":false,"given":"Valeria","family":"Isella","sequence":"first","affiliation":[{"name":"Neurology Department, S. 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