.) The intent of the proposed research is to relate aphasic patients' reduced memory spans to single word processing, to sentence comprehension and production, and to long-term learning. A basic assumption of this research is that there are separable phonological and lexical- semantic contributions to memory span that may be independently disrupted in different patients.Patients' performance on word perception, lexical comprehension and word production will be evaluated to determine the extent to which there is a correspondence or dissociation between phonological and semantic abilities in word processing and phonological and semantic retention capacities. One issue to be addressed is whether there are separable input and output phonological STM capacities that relate to patients' speech perception and production abilities. At the level of sentence processing, the proposed research will investigate whether the lexical-semantic retention capacity that appears to be involved in sentence comprehension also plays an important role in speech production. Although phonological STM does not appear to be critical to sentence comprehension, it is possible that this capacity is involved in speech planning at the phonological level. With regard to long-term learning, the proposed studies will investigate whether deficits in the short-term retention at the phonological and lexical-semantic levels lead to impaired long-term learning deficits for phonological and lexical-semantic information. A modified case study approach will be used, in that a relatively small number of patients will be tested on a large number of tasks. The advantage of the case study approach is that dissociations that might be present in a few cases (e.g., good syntactic comprehension together with reduced memory span) might be masked in group data. The approach differs from typical case studies, however, in that a number of patients will be tested on the same tasks. In this fashion it should be possible to determine whether deficits that appear to be associated in some cases are necessarily associated in all cases.

National Institute of Health (NIH)
National Institute on Deafness and Other Communication Disorders (NIDCD)
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Special Emphasis Panel (ZRG1-HAR (01))
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Rice University
Schools of Arts and Sciences
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Rummer, Ralf; Schweppe, Judith; Martin, Randi C (2013) Two Modality Effects in Verbal Short-Term Memory: Evidence from Sentence Recall. J Cogn Psychol (Hove) 25:231-247
Allen, Corinne M; Martin, Randi C; Martin, Nadine (2012) Relations between Short-term Memory Deficits, Semantic Processing, and Executive Function. Aphasiology 26:428-461
Vuong, Loan C; Martin, Randi C (2011) LIFG-based attentional control and the resolution of lexical ambiguities in sentence context. Brain Lang 116:22-32
Slevc, L Robert; Martin, Randi C; Hamilton, A Cris et al. (2011) Speech perception, rapid temporal processing, and the left hemisphere: a case study of unilateral pure word deafness. Neuropsychologia 49:216-30
Martin, Randi C; Crowther, Jason E; Knight, Meredith et al. (2010) Planning in sentence production: evidence for the phrase as a default planning scope. Cognition 116:177-92
Hamilton, A Cris; Martin, Randi C; Burton, Philip C (2009) Converging functional magnetic resonance imaging evidence for a role of the left inferior frontal lobe in semantic retention during language comprehension. Cogn Neuropsychol 26:685-704
Romani, Cristina; McAlpine, Sheila; Martin, Randi C (2008) Concreteness effects in different tasks: implications for models of short-term memory. Q J Exp Psychol (Colchester) 61:292-323
Martin, Randi C; Allen, Corinne M (2008) A disorder of executive function and its role in language processing. Semin Speech Lang 29:201-10;C 4-5
Hull, Rachel; Martin, Randi C; Beier, Margaret E et al. (2008) Executive function in older adults: a structural equation modeling approach. Neuropsychology 22:508-22
Biegler, Kelly A; Crowther, Jason E; Martin, Randi C (2008) Consequences of an inhibition deficit for word production and comprehension: evidence from the semantic blocking paradigm. Cogn Neuropsychol 25:493-527

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