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This typicality effect reflects normal representation and processing of semantic categories and when absent may be reflective of lexical\u2013semantic deficits. We examined typicality effects in individuals with semantic and nonsemantic variants of primary progressive aphasia (PPA; semantic\u2014PPA-S, agrammatic\u2014PPA-G), a neurodegenerative disorder characterized by specific decline in language function, and age-matched controls. Using a semantic category verification task, where participants were asked to decide whether visual or auditory words (category typical, atypical, or nonmembers) belonged within a specified superordinate category, we found a typicality effect (ie, faster response times for typical vs atypical items) for all participant groups. However, participants with more severe PPA-S did not show a typicality effect in either modality. Findings may reflect increased intracategory semantic blurring as the disease progresses and semantic impairment becomes more severe.<\/jats:p>","DOI":"10.1177\/1533317518762443","type":"journal-article","created":{"date-parts":[[2018,3,16]],"date-time":"2018-03-16T04:26:40Z","timestamp":1521174400000},"page":"292-300","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":9,"title":["Semantic Typicality Effects in Primary Progressive Aphasia"],"prefix":"10.1177","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0652-3104","authenticated-orcid":false,"given":"Ellyn A.","family":"Riley","sequence":"first","affiliation":[{"name":"Aphasia and Neurolinguistics Research Laboratory, Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elena","family":"Barbieri","sequence":"additional","affiliation":[{"name":"Aphasia and Neurolinguistics Research Laboratory, Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sandra","family":"Weintraub","sequence":"additional","affiliation":[{"name":"Cognitive Neurology and Alzheimer\u2019s Disease Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M. Marsel","family":"Mesulam","sequence":"additional","affiliation":[{"name":"Cognitive Neurology and Alzheimer\u2019s Disease Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cynthia K.","family":"Thompson","sequence":"additional","affiliation":[{"name":"Aphasia and Neurolinguistics Research Laboratory, Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL, USA"},{"name":"Cognitive Neurology and Alzheimer\u2019s Disease Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2018,3,16]]},"reference":[{"key":"bibr1-1533317518762443","doi-asserted-by":"publisher","DOI":"10.1037\/0096-3445.104.3.192"},{"key":"bibr2-1533317518762443","unstructured":"Rosch EH. On the internal structure of perceptual and semantic categories. 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