title: Which language declines more? longitudinal versus cross-sectional decline of picture naming in bilinguals with Alzheimer's disease.
abstract: In this study, we investigated dual-language decline in non-balanced bilinguals with probable Alzheimer's disease (AD) both longitudinally and cross-sectionally. We examined patients' naming accuracy on the Boston Naming Test (BNT: Kaplan et al., 1983) over three testing sessions (longitudinal analysis) and compared their performance to that of matched controls (cross-sectional analysis). We found different longitudinal and cross-sectional patterns of decline: Longitudinally, the non-dominant language seemed to decline more steeply than the dominant language, but, cross-sectionally, differences between patients and controls were larger for the dominant than for the non-dominant language, especially at the initial testing session. This differential pattern of results for cross-sectional versus longitudinal decline was supported by correlations between decline measures and BNT item characteristics. Further studies will be needed to better characterize the nature of linguistic decline in bilinguals with AD; however, these results suggest that representational robustness of individual lexical representations, rather than language membership, might determine the time course of decline for naming in bilinguals with AD.
authors.affiliation: 1Department of Psychiatry,University of California,San Diego,California.
authors.forename: Iva
authors.initials: I
authors.lastname: Ivanova
authors.affiliation: 2Department of Neurosciences,University of California,San Diego,California.
authors.forename: David P
authors.initials: DP
authors.lastname: Salmon
authors.affiliation: 1Department of Psychiatry,University of California,San Diego,California.
authors.forename: Tamar H
authors.initials: TH
authors.lastname: Gollan
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000150:complications* / Q000523:psychology; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007806:Language Disorders / Q000209:etiology*; D008137:Longitudinal Studies; D008297:Male; D019303:Multilingualism; D009275:Names; D010775:Photic Stimulation
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