Judgment of functional morphology in agrammatic aphasia

Michael Walsh Dickey*, Lisa H. Milman, Cynthia K Thompson

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Individuals with agrammatic Broca's aphasia show deficits in production of functional morphemes like complementizers (e.g., that and if) and tense and agreement markers (e.g., -ed and -s), with complementizers often being more impaired than verbal morphology. However, there has been comparatively little work examining patients' ability to comprehend or judge the grammaticality of these morphemes. This paper investigates comprehension of complementizers and verb inflections in two timed grammaticality-judgment experiments. In Experiment 1, participants with agrammatic Broca's aphasia and grammatical-morphology production deficits (n=10) and unimpaired controls (n=10) heard complement clause sentences, subject relative clause sentences, and conjoined sentences. In Experiment 2, the same participants heard sentences with finite auxiliaries, sentences with finite main verbs, and sentences with uninflected verbs. Results showed above-chance accuracy in aphasic participants' judgments for complementizer sentences in Experiment 1, but chance performance for verb inflections in Experiment 2. This pattern held regardless of whether the verb inflections were affixes or free-standing auxiliaries. Implications of these results for theories of agrammatic morphological impairments, including feature underspecification accounts [Wenzlaff, M., & Clahsen, H. (2004). Tense and agreement in German agrammatism. Brain and Language, 89, 57-68; Burchert, F., Swoboda-Moll, M., & De Bleser, R. (2005a). Tense and agreement dissociations in German agrammatic speakers: Underspecification vs. hierarchy. Brain and Language, 94, 188-199] and hierarchical structure-based accounts [Friedmann, N., & Grodzinsky, Y. (1997). Tense and agreement in agrammatic production: Pruning in the syntactic tree. Brain and Language, 56, 397-425; Izvorski, R., & Ullman, M. (1999). Verb inflection and the hierarchy of functional categories in agrammatic anterior aphasia. Brain and Language, 69, 288-291], are discussed.

Original languageEnglish (US)
Pages (from-to)35-65
Number of pages31
JournalJournal of Neurolinguistics
Volume21
Issue number1
DOIs
StatePublished - Jan 1 2008

Fingerprint

Broca Aphasia
Aphasia
speech disorder
Language
brain
experiment
Brain
language
deficit
Aptitude
comprehension
Agrammatic Aphasia
Experiment
Complementizer
Verb Inflection
ability
performance
Tense

Keywords

  • Agrammatism
  • Aphasia
  • Functional categories
  • Grammatical morphology
  • Grammaticality judgment
  • Perception

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)
  • Linguistics and Language
  • Cognitive Neuroscience

Cite this

Dickey, Michael Walsh ; Milman, Lisa H. ; Thompson, Cynthia K. / Judgment of functional morphology in agrammatic aphasia. In: Journal of Neurolinguistics. 2008 ; Vol. 21, No. 1. pp. 35-65.
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Judgment of functional morphology in agrammatic aphasia. / Dickey, Michael Walsh; Milman, Lisa H.; Thompson, Cynthia K.

In: Journal of Neurolinguistics, Vol. 21, No. 1, 01.01.2008, p. 35-65.

Research output: Contribution to journalArticle

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