Psycholinguistic predictors of naming accuracy and decline in bilingual logopenic primary progressive aphasia: a cross-linguistic case study

Naming impairment is a hallmark of logopenic primary progressive aphasia (lvPPA), yet its effects in bilingualism remain understudied. This study examined naming accuracy in a 78-year-old Chinese-English bilingual woman with lvPPA over two years using a modified Boston Naming Test. Naming accuracy was higher in her second, but more frequently used language (English) than her first, but less frequently used language (Chinese). Regression analyses revealed that familiarity predicted naming in Chinese, while word length and age of acquisition influenced English. Decline was linked to age of acquisition in Chinese and emotional properties in English, highlighting language-specific patterns in bilingual lvPPA.