PMID- 32909656 OWN - NLM STAT- MEDLINE DCOM- 20211025 LR - 20220102 IS - 1460-6984 (Electronic) IS - 1368-2822 (Print) IS - 1368-2822 (Linking) VI - 56 IP - 1 DP - 2021 Jan TI - Development of a measure of function word use in narrative discourse: core lexicon analysis in aphasia. PG - 6-19 LID - 10.1111/1460-6984.12567 [doi] AB - BACKGROUND: Although discourse-level assessments contribute to predicting real-world performance in persons with aphasia (PWA), the use of discourse measures is uncommon in clinical settings due to resource-heavy procedures. Moreover, assessing function word use in discourse requires the arduous procedure of defining grammatical categories for each word in language transcripts. AIMS: The purpose of this exploratory study was twofold: (1) to develop core function word lists as a clinician-friendly means of evaluating function word use in discourse; and (2) to examine the ability of the core function word measure to differentiate PWA from cognitively healthy adults and persons with fluent aphasia from non-fluent aphasia. METHODS & PROCEDURES: The 25 most commonly used function words (core function words) were extracted from narrative language samples from 470 cognitively healthy adults, which were divided into seven age groups (20s, 30s, 40s, 50s, 60s, 70s and 80s). The percent agreement of core function words for 11 PWA (fluent aphasia = 5; non-fluent aphasia = 6) and 11 age- and education-matched controls were then calculated. Percent agreement for the core function words produced was compared between the controls and the PWA group, and between participants with fluent aphasia and non-fluent aphasia. OUTCOMES & RESULTS: The results indicated that PWA produced fewer core function words from the lists than the control group, and that core function word use was strongly correlated with aphasia severity. Persons with non-fluent aphasia produced fewer core function words than those with fluent aphasia, although this could be a confound of aphasia classification from the use of the Western Aphasia Battery (WAB)-Revised. CONCLUSIONS & IMPLICATIONS: Core function word lists consisting of a limited number of items for quantifying function word use in discourse remain in a nascent stage of development. However, the findings are consistent with previous studies analysing the total production of function words in language samples produced by PWA. Therefore, core function words may potentially serve as a clinician-friendly manner of quantifying function words produced in discourse. What this paper adds What is already known on the subject Function word analysis in discourse requires arduous processes of identifying the error production and grammatical category of function words in discourse. Previous studies have demonstrated that core lexicon measures are an efficient, simple means of quantifying discourse in PWA. However, function words have never been considered for generating an independent core lexicon list. What this paper adds to existing knowledge As an exploratory study, we focused primarily on developing a clinician-friendly measure to evaluate function word production in discourse, motivated by the idea of an adaptation strategy within the core lexicon framework. Our findings demonstrated that by using a simple scoring system that the core lexicon measure provides, we differentiated the control group from the PWA group, and persons with fluent aphasia from persons with non-fluent aphasia. Additionally, we found significant correlations between function word production and aphasia severity determined by WAB Aphasia Quotient (AQ). What are the potential or actual clinical implications of this work? The results add empirical evidence for the utility of core function word lists for quantifying function word usage in discourse in PWA. Counting the presence and absence of function words in discourse will allow clinicians to avoid labour-intensive preparatory work, and to obtain useful diagnostic information in a less time-consuming way. CI - (c) 2020 Royal College of Speech and Language Therapists. FAU - Kim, Hana AU - Kim H AUID- ORCID: 0000-0002-4183-4867 AD - Department of Communication Sciences and Disorders, East Carolina University, Greenville, NC, USA. FAU - Kintz, Stephen AU - Kintz S AD - Department of Audiology and Speech Pathology, University of Arkansas, Little Rock, AK, USA. FAU - Wright, Heather Harris AU - Wright HH AD - Department of Communication Sciences and Disorders, East Carolina University, Greenville, NC, USA. LA - eng GR - R01 AG029476/AG/NIA NIH HHS/United States GR - R03 AG042892/AG/NIA NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural DEP - 20200910 PL - United States TA - Int J Lang Commun Disord JT - International journal of language & communication disorders JID - 9803709 SB - IM MH - *Aphasia/diagnosis MH - Aphasia, Wernicke MH - Humans MH - Language MH - Narration PMC - PMC7902380 MID - NIHMS1631339 OTO - NOTNLM OT - aphasia OT - core lexicon OT - discourse analysis OT - function word COIS- Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper. EDAT- 2020/09/11 06:00 MHDA- 2021/10/26 06:00 PMCR- 2022/01/01 CRDT- 2020/09/10 08:44 PHST- 2019/06/30 00:00 [received] PHST- 2020/07/09 00:00 [revised] PHST- 2020/07/27 00:00 [accepted] PHST- 2020/09/11 06:00 [pubmed] PHST- 2021/10/26 06:00 [medline] PHST- 2020/09/10 08:44 [entrez] PHST- 2022/01/01 00:00 [pmc-release] AID - 10.1111/1460-6984.12567 [doi] PST - ppublish SO - Int J Lang Commun Disord. 2021 Jan;56(1):6-19. doi: 10.1111/1460-6984.12567. Epub 2020 Sep 10.