Publications
Book Chapter
Kintz, S., Fergadiotis, G., & Wright, H. H. (2016). Aging effects on discourse production. In Wright, H. H. (Ed.) Cognition, language, and aging (pp. 81 – 106). Philadelphia, PA: John Benjamins Publishing Company.
Peer-Reviewed Publications
2025
Azios, J., Fergadiotis, G., McMahon, M., & Cherney, L. (2025). Validity and reliability of the Transactional Exchanges in Texting for Aphasia (TEXT-A) Rating Scale. Journal of Speech, Language, and Hearing Research, 68(12), 5910-5920.
Casilio, M., Fergadiotis, G., Cho, S-J., Steel, S., Fleegle, M., Dickey, M., & Hula, W. (2025). Construct validation of the Verb Naming Test for aphasia. Journal of Speech, Language, & Hearing Research, 68(4), 1932-1949. DOI: 10.1044/2024_JSLHR-24-0023
Thomas, A. B., Fergadiotis, G., Nelson, L. A., Van Son, C. R., & Barbosa-Leiker, C. Understanding the care needs of people with post-stroke aphasia: A qualitative study of stroke care transitions. Global Qualitative Nursing Research, 12.doi:10.1177/23333936251346440
Thomas, A.B., Van Son, C.R., Fergadiotis, G., Nelson, L., Barbosa-Leiker, C. (2025). Principal-based concept analysis of Supported Conversation for Adults with Aphasia™. Research and Theory for Nursing Practice, 39(3). Online ahead of print. DOI: 10.1891/RTNP-2024-0094
2024
Mazumdar, B., De La Mora, N., Roberts, T., Swiderski, A., Kapantzoglou, M., & Fergadiotis, G. (2024). Response latencies during confrontation picture naming in aphasia: Are proxy measurements sufficient? Journal of Speech, Language, and Hearing Research, 67(5), 1548-1557. DOI: 10.1044/2024_JSLHR-23-00452
2023
Salem, A., Gale, R., Fleegle, M., Fergadiotis, G., & Bedrick, S. (2023). Automating intended target identification for paraphasias in discourse using a large language model. Journal of Speech, Language, and Hearing Research, 66(12), 4949-4966.
Fergadiotis, G., Casilio, M., Steel, S., Fleegle, M., Dickey, M., & Hula, W. (2023). Item response theory modeling of the Verb Naming Test. Journal of Speech, Language, and Hearing Research, 66(5), 1718-1739. DOI: 10.1044/2023_JSLHR-22-00458. PMID: 37000934
Swiderski, A., Hula, W., & Fergadiotis, G. (2023). Accuracy of naming error profiles elicited from adaptive short forms of the Philadelphia Naming Test. Journal of Speech, Language, and Hearing Research, 66(4), 1351-1364. DOI: 10.1044/2023_JSLHR-22-00439. PMID: 37014997
Casilio, M., Fergadiotis, G., Salem, A., Gale, R., McKinney-Bock, K., & Bedrick, S. (2023). ParAlg: A paraphasia algorithm for multinomial classification of picture naming errors. Journal of Speech, Language, and Hearing Research, 66(3), 966-986. DOI: 10.1044/2022_JSLHR-22-00255.
Salem. A., Gale, R., Casilio, M., Fleegle, M., Fergadiotis, G., & Bedrick, S. (2023). Refining semantic similarity of paraphasias using a contextual language model. Journal of Speech, Language, and Hearing Research, 66(1), 206-220. DOI: 10.1044/2022_JSLHR-22-00277.
2021
Kapantzoglou, M., Esparza Brown, J., Auza, A., & Fergadiotis, G. (2021). Code switching and language proficiency in bilingual children with and without developmental language disorder. Journal of Speech, Language, and Hearing Research, 1-16. https://doi.org/10.1044/2020_JSLHR-20-00182
2020
Silkes, J., Fergadiotis, G., Graue, K., & Kendall, D. (2020). Effects of phonomotor therapy and semantic feature analysis on discourse production. American Journal of Speech Language Pathology, 1-14. DOI: 10.1044/2020_AJSLP-19-00111
Hula, W. D., Fergadiotis, G., Swiderski, A., Silkes, J. A., & Kellough, S. (2020). Empirical evaluation of computer-adaptive alternate short forms for the assessment of anomia severity. Journal of Speech, Language, and Hearing Research, 63(1), 163-172. DOI: 10.1044/2019_JSLHR-L-19-0213
2019
Fergadiotis, G., Hula, W. D., Swiderski, A., Lei, C. M., & Kellough, S. (2019). Enhancing the efficiency of confrontation naming assessment for aphasia using computer adaptive testing. Journal of Speech, Language, and Hearing Research, 62(6), 1724-1738. DOI: 10.1044/2018_JSLHR-L-18-0344
Kapantzoglou, M., Fergadiotis, G., & Auza, A. (2019). Psychometric evaluation of lexical diversity indices in Spanish narrative samples from children with and without developmental language disorder. Journal of Speech, Language, and Hearing Research. https://doi.org/10.1044/2018_JSLHR-L-18-0110
2018
Silkes, J., Fergadiotis, G., Hunting Pompon, R., Torrence, J. & Kendall, D. (2018). Effects of phonomotor treatment on discourse production. Aphasiology, 33(2), 125-139, DOI: 10.1080/02687038.2018.1512080
Fergadiotis, G., Swiderski, A., & Hula, D. W. (2018). Predicting confrontation naming item difficulty. Aphasiology, doi-org.proxy.lib.pdx.edu/10.1080/02687038.2018.1495310
Fergadiotis, G., Kapantzoglou, M., Kintz, S. & Wright, H. H. (2018). Modeling confrontation naming and discourse informativeness using structural equation modeling. Aphasiology, DOI: 10.1080/02687038.2018.1482404
2017
Kapantzoglou, M., Fergadiotis, G., & Restrepo, M. A. (2017). Language sample analysis and elicitation-technique effects in bilingual children with and without language impairment. Journal of Speech, Language, and Hearing Research, 60(10), 2852-2865. doi:10.1044/2017_JSLHR-L-16-0335
Adams, J., Bedrick, S., Fergadiotis, G., Gorman, K., and van Santen, J. (2017). Target word prediction and paraphasia classification in spoken discourse. In Proceedings of the BioNLP Workshop, 1-8.
2016
Fergadiotis, G., Gorman, K., & Bedrick, S. (2016). Algorithmic Classification of Five Characteristic Types of Paraphasias. American Journal of Speech-Language Pathology, 25, S776-S787. DOI:10.1044/2016_AJSLP-15-0147
Kintz, S., Wright, H. H., & Fergadiotis, G. (2016). Semantic Knowledge Use in Discourse Produced by Individuals with Anomic Aphasia. Aphasiology, 30(9), 1012-1025.
Fergadiotis, G., & Wright, H. H. (2015). The relationship of confrontation naming tests and paraphasias in discourse. Aphasiology. DOI:10.1080/02687038.2015.1067288
2015
Hula, W. D., Kellough, S., & Fergadiotis, G. (2015). Development and Simulation Testing of a Computerized Adaptive Version of the Philadelphia Naming Test. Journal of Speech, Language, and Hearing Research, 1–13. http://doi.org/10.1044/2015_JSLHR-L-14-0297.
Fergadiotis, G., Kellough, S., & Hula, W. D. (2015). Item response theory modeling of the Philadelphia Naming Test. Journal of Speech, Language, and Hearing Research, 58, 865-877. DOI: 10.1044/2015_JSLHR-L-14-0249.
Fergadiotis, G., Wright, H. H., & Green, S. B. (2015). Psychometric Evaluation of Lexical Diversity Indices: Assessing Length Effects. Journal of Speech, Language, and Hearing Research, 58, 840-852. DOI: 10.1044/2015_JSLHR-L-14-0280.
2014
Wright, H. H., Koutsoftas, A., Capilouto, G. J., & Fergadiotis, G. (2014). Global coherence in younger and older adults: Influence of cognitive processes and discourse type. Aging, Neuropsychology, and Cognition. 21(2), 174-196.
2013
Fergadiotis, G., Wright, H. H., & West, N. T. (2013). Measuring lexical diversity in narrative discourse from people with aphasia. American Journal of Speech-Language Pathology, 22(2), 397-408.
2012
Hula, D. W., & Fergadiotis, G., & Martin, N. (2012). The effects of sample size and guessing on parameter recovery in IRT modeling of aphasia test data. American Journal of Speech-Language Pathology. 21, S38-S49.
Wright, H. H., & Fergadiotis, G. (2012). Conceptualizing and Measuring Working Memory and its Relationship to Aphasia. Aphasiology, 26(3-4), 258-278. DOI:10.1080/02687038.2011.604304
2011
Fergadiotis, G., & Wright, H. H. (2011). Lexical diversity for adults with and without aphasia across discourse elicitation tasks. Aphasiology, 25, 1414-1430.
Fergadiotis, G., Wright, H.H., & Capilouto, G. (2011). Productive vocabulary across discourse types. Aphasiology, 25(10), 1261-1278.
Wright, H. H., Capilouto, G. J., Srinivasan, C., & Fergadiotis, G. (2011). Story processing ability in cognitively healthy younger and older adults. Journal of Speech, Language, and Hearing Research. 54, 900-917.
Invited Peer-Reviewed Commentary
2014
Hula, D. W., Fergadiotis, G., & Doyle, J. P. (2014). A Core Outcome Set for Aphasia Treatment Research: Obstacles, Risks, and Benefits. Aphasiology. DOI: 10.1080/02687038.2014.930264
2013
Dietz, A., & Fergadiotis, G. (2013). This study into the perceptions of caregivers and people with aphasia following a course on total communication yielded promising results, but there are methodological concerns. Evidence-Based Communication Assessment and Intervention, 7(1), 46-51.
Conference Proceedings
Hula, W., Benett, C., Swiderski, A., Steel, S., Ranjan, C., Nicholson, H., Babiak, M., & Fergadiotis, G. (2026, May 26-29). Lexical characteristics usefully predict confrontation naming item difficulty [Poster presentation]. Clinical Aphasiology Conference, Pittsburgh, PA.
Fergadiotis, G., Casilio, M., Fleegle, M., Steel, S., & Hula, W. (2026, May 26-29). Parsimony without loss: Simplified IRT-MPT models preserve concurrent validity [Poster presentation]. Clinical Aphasiology Conference, Pittsburgh, PA.
Casilio, M., Kaiser, H.*, Kosova, I.*, Steel, S., & Fergadiotis, G. (2026, May 26-29). Common ground as a unifying factor of communicative success in aphasia [Roundtable session]. Clinical Aphasiology Conference, Pittsburgh, PA. *NIDCD Research Symposium Fellows
Parisien, E.*, Casilio, M., Shibata, K., Sekine, K., Wilson, S., Wilson, S., & Fergadiotis, G. (2026, May 26-29).Development of the Japanese Auditory-Perceptual Rating of Connected Speech in Aphasia. Poster accepted for presentation at the Clinical Aphasiology Conference, Pittsburgh, PA. *NIDCD Research Symposium Fellows
Lee, J. B., Azios, J. H., McMahon, M., & Fergadiotis, G. (2026, May 26-29). Psychometric evaluation of the expanded transactional EXchanges in Texting for Aphasia (TEXT-A) rating scale. Accepted for platform presentation at the Clinical Aphasiology Conference, Pittsburgh, PA.
2026/05 ZRG1 BP-D (51) R, PAR Panel: Tackling Acquisition of Language in Kids (TALK) 2026 – Present Member, NIDCD LCOM Study Section.
Casilio, M. & Fergadiotis, G. (2025, September). Disentangling noun and verb production in aphasia: Evidence from item response theory. Poster presented at the 2025 Science of Aphasia Conference in Copenhagen, Denmark.
Fleegle, M., Casilio, M., Steel, S., McCoy, C., & Fergadiotis, G. (October, 2025). Exploring an acoustic metric for differential diagnosis of apraxia of speech. Poster presented at the 2025 Academy of Aphasia Meeting, San Diego, CA.
Hula, D. W., Nunn, K., Swiderski, A., Nicholson, H., Steel, S., Ranjan, C., Babiak, M., Fergadiotis, G. (2025). Cross-walking commonly used picture naming tests for aphasia. Platform presentation at the Clinical Aphasiology Conference, Albuquerque, NM.
Fleegle, M., Casilio, M., Fergadiotis, G. (2025). Poster presented at the Clinical Aphasiology Conference, Albuquerque, NM.
Hula, W., Swiderski, A., Nicholson, H., Steel, S., Ranjan, C., Babiak, M., & Fergadiotis, G. (2024, May 28 – June 1). Comparison of factors underlying picture naming difficulty in persons with aphasia and healthy speakers: Validity of the TAAWF for measuring anomia severity in aphasia [Poster presentation]. Clinical Aphasiology Conference, Waikoloa, Hawaii.
Hula, W., Swiderski, A., Nicholson, H., Steel, S., Ranjan, C., Babiak, M., & Fergadiotis, G. (2024, May 28 – June 1). Comparison of factors underlying picture naming difficulty in persons with aphasia and healthy speakers: Validity of the TAAWF for measuring anomia severity in aphasia [Poster presentation]. Clinical Aphasiology Conference, Waikoloa, Hawaii.
Gale, R., Fleegle, M., Fergadiotis, G., & Bedrick, S. (2022). The post-stroke speech transcription (PSST) challenge. Proceedings of the RaPID-4, 41–55.
Fergadiotis, G., & Wright, H. H. (2013). Effects of Truncation on Language Sample
Analysis in Aphasia. Procedia-Social and Behavioral Sciences, 94, 228-229.
Galeto, V., Kintz, S., West, T., Marini, A., Harris Wright, H., & Fergadiotis, G. (2013) Measuring Global Coherence in Aphasia. Procedia-Social and Behavioral Sciences, 94, 198-199.
Wright, H., Fergadiotis, G., Koutsoftas, A., & Capilouto, G. (2010). Coherence in stories told by adults with aphasia. Procedia Social and Behavioral Sciences. 6,111-112.
Fergadiotis, G., Wright, H., & Capilouto, G. (2010). Psychometric properties of the Pyramids and Palm Trees tests. Procedia Social and Behavioral Sciences. 6, 33-34.