Impairments of derivational word formation in agrammatic aphasia

Fix, Steve; Dickey, Michael Walsh; Thompson, Cynthia K.

doi:10.1016/j.bandl.2005.07.071

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Halle & Marantz, 1993;Harley & Noyer, 2003). These morphology-specific representations and operations may also be independently impaired in agrammatism (Fix, 2005;Fix, Dickey, & Thompson, 2005). Given this interpretive view of morphology, successful computation of the relevant hierarchical syntactic structure is a prerequisite for successful insertion of grammatical morphemes (such as complementizers or verb inflections).…”

Section: Article In Pressmentioning

confidence: 98%

Judgment of functional morphology in agrammatic aphasia

Dickey

Milman

Thompson

2008

Journal of Neurolinguistics

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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 & Clahsen, 2004; Burchert, Swoboda-Moll & DeBleser, 2005a) and hierarchical structure-based accounts (Friedmann & Grodzinsky, 1997; Izvorski & Ullman, 1999), are discussed.

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Section: Article In Pressmentioning

confidence: 98%

Judgment of functional morphology in agrammatic aphasia

Dickey

Milman

Thompson

2008

Journal of Neurolinguistics

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Morphophonological structure and agrammatic regular/irregular past-tense production

Fix¹,

Thompson²

2006

Brain and Language

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Investigating deaf students’ knowledge of Persian syntax: Further evidence for a critical period hypothesis

Gheitury¹,

Ashraf²,

Hashemi³

2013

Neurocase

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The present study aims to investigate syntactic deficits in 13 Iranian deaf students aged between 17 and 21 years. Four tests in the form of sentence-recognition and sentence-completion were administered to examine their knowledge of verb inflection, derivational morphology, word order, and prepositions. A between-category analysis of errors indicated a significant dissociation between categories, most notably between verb inflection and derivational morphology and between word order as the category with fewest errors and the three others. On theoretical grounds, the fact that subjects have not acquired much syntax even after years of learning seemed to strengthen the significance of acquiring syntax and morphology in the early years.

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Impairments of derivational word formation in agrammatic aphasia

Cited by 3 publications

References 7 publications

Judgment of functional morphology in agrammatic aphasia

Judgment of functional morphology in agrammatic aphasia

Morphophonological structure and agrammatic regular/irregular past-tense production

Investigating deaf students’ knowledge of Persian syntax: Further evidence for a critical period hypothesis

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