Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan


  • Lyn S. TurkstraEmail author
  • Cynthia K. Thompson
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_849


Agrammatic aphasia


Agrammatism refers to language production that is lacking in grammatical structures. The basic signs of agrammatism are short phrase length, simplified syntax, errors and omissions of main verbs, and omission or substitution of grammatical morphemes such as plural markers or functors (Saffran et al. 1989). There may also be errors in tense, number, and gender, and difficulty in producing sentences with movement of grammatical elements, such as passive sentences, Wh- questions, and complex sentences (Benedet et al. 1998; Caplan and Hanna 1998; Goodglass 1997; Faroqi-Shah and Thompson 2004). Spoken and written production typically shows similar error patterns. Typically, individuals with agrammatic aphasia also show impaired comprehension of grammatical structures, particularly noncanonical semantically reversible sentences (e.g., “the boy was kicked by the horse”; Berndt et al. 1996; Caramazza and Zurif 1976).

Historical Background


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Authors and Affiliations

  1. 1.School of Rehabilitation Science, McMaster UniversityHamiltonCanada
  2. 2.Northwestern UniversityEvanstonUSA