Verb-Semantic Feature Analysis for Alzheimer's Dementia in a verb-final language: evidence from Korean

This study examined the effects of Verb-Semantic Feature Analysis (Verb-SFA) on verb naming, noun retrieval, sentence comprehension, and discourse production in individuals with Dementia of the Alzheimer's Type (DAT). Given the lexical-semantic degradation characteristic of DAT and the central role of verbs in Korean, a verb-final language, this study evaluated whether Verb-SFA facilitates treatment, near-transfer, and far-transfer effects. Three male participants, aged 60 or older with 16 years of education, completed 17 sessions: pre-treatment (4 sessions), treatment (10 sessions), and post-treatment (3 sessions). Treatment effects were assessed using 45-item probe sets derived from the Korean Item Selection Naming Test. Results showed significant improvement in naming accuracy for treated verbs, with a robust interaction between treatment sessions and treated items. No significant near-transfer effects were found for untreated verbs in the probe set or on the Action Naming Test. However, significant near-transfer effects were observed for noun retrieval on the Korean-Boston Naming Test, although verbal fluency tasks showed no improvement. Far-transfer effects emerged in sentence comprehension, suggesting strengthened verb-semantic processing supports higher-level linguistic abilities. No measurable gains were observed in discourse production. Overall, Verb-SFA treatment enhanced verb naming and sentence comprehension in individuals with DAT.