The “tree-pruning hypothesis” in bilingualism
Tissen, Andrea and Weber, Sandra and Grande, Marion and Gunther, Thomas
The “tree-pruning hypothesis” in bilingualism . Aphasiology, 21(6-8), August, 2007, pages 548-557.
Background: The “tree-pruning hypothesis” (TPH) suggests that syntactic deficits in agrammatic production are highly selective: most patients have impaired tense inflection while their agreement inflection is preserved. The TPH states that the split-inflection tree is pruned at the tense node, which is why an obvious dissociation in performance exists between tense and agreement.
Aims: This study aims to determine whether the TPH applies to a bilingual individual by examining whether a dissociation in performance exists between agreement and tense inflection in the bilingual speaker's two languages: German and Luxembourgish. We expect the pattern of grammatical impairment to support the validity of the TPH in German and Luxembourgish.
Methods & Procedures: The participant examined in this study, AM, is a pre-onset balanced German-Luxembourgish speaker with Broca's aphasia and moderate agrammatism. We used a verb completion and grammatical assessment task to examine whether a dissociation in performance existed between tense and agreement in both languages.
Outcomes & Results: The results comply with the TPH. The agreement results produced by the participant were significantly better than the tense results in both German and Luxembourgish.
Conclusions: The results show a clear dissociation in each language as predicted by the TPH. This confirms that the TPH can be applied to both German and Luxembourgish.
|EPrint Type:||Journal (Paginated)|
|Conference:||Clinical Aphasiology Conference: Clinical Aphasiology Conference (2006 : 36th : Ghent, Belgium : May 29-June 2, 2006)|
|Publisher:||Taylor and Francis|
|DOI or Unique Handle:||10.1080/02687030701191952|
|Additional Information:||Access to the full text is subject to the publisher's access restrictions.|