Linguistic Features in the Connected Speech for Primary Progressive Aphasia: Evidence from a Meta-analysis

Jimin Park, Jee Eun Sung, Young Tae Kim

Research output: Contribution to journalArticlepeer-review


Objectives: Primary progressive aphasia (PPA) is a neurodegenerative disease, where language disorder is a predominant symptom. Previous studies demonstrated that individuals with PPA shows different syntactic abilities when compared to other degenerative syndromes, suggesting that connected speech is the appropriate task for examining syntactic features. Therefore, the current study investigated the linguistic features of PPA in connected speech by conducting a systematic review. Methods: Thirteen studies were extracted from the three foreign databases (CINAHL EBSCO, PubMed, SCOPUS). Fluency, syntactic, and lexical features were converted to Hedges’ g to calculate the effect size of speech production among people with PPA and the control, and between linguistic features. Results: First, the PPA group showed a worse performance overall in the connected speech tasks compared to the control, having a moderate effect on only linguistic features. Second, the PPA group showed worse performance compared to the control in the fluency features, having PPA types as a moderator. Third, the control had better performance in the syntactic features, showing severity as a moderator. Lastly, performance between the PPA group and the control in lexical features had a moderate effect on PPA type. Conclusion: The current study demonstrated that the speech production of individuals with PPA in connected speech has a moderate effect on linguistic features. Moreover, the analysis of linguistic features of PPA in connected speech showed that each linguistic features has a different moderator.

Original languageEnglish
Pages (from-to)111-126
Number of pages16
JournalCommunication Sciences and Disorders
Issue number1
StatePublished - 2023

Bibliographical note

Funding Information:
Department of Communication Disorders, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea Tel: +82-2-3277-2120 Fax: +82-2-3277-2122 E-mail: This research was partly supported by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIT) (No. CAP21052-000), the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2022R1A2C2005062) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2022R1I1A4063209).

Publisher Copyright:
© 2023 Korean Academy of Speech-Language Pathology and Audiology


  • Connected speech
  • Linguistic features
  • Meta-analysis
  • Primary progressive aphasia


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