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Professor BAKHTIAR, Mehdi

Professor BAKHTIAR, Mehdi

Professor BAKHTIAR, Mehdi

Assistant Professor

Academic Unit of Human Communication, Learning, and Development

Qualification

PhD (HKU)
MSc (Tehran University of Medical Sciences)
BSc (University of Social Welfare and Rehabilitation Sciences)

Email

[javascript protected email address]

Phone

(852) 3917 1592

Location

Room 761, Meng Wah Complex

Prospective PhD/ EdD/ MPhil Applications

I am available to supervise PhD/MPhil students and would welcome enquiries for supervision.

Links

Research Interests:
  • Stuttering and Fluency Disorders
  • Neurogenic Communication Disorders
  • Neuromodulation in Speech and Language Disorders
  • Development of speech and language tests
 
Teaching areas:
  • SHSC 1033 Introduction to Communication Disorders
  • SHSC 1034 Anatomy & Physiology for Speech and Hearing
  • SHSC 4034 Fluency, Laryngectomy, and Craniofacial Anomalies

  • General Research Fund (HK $662,436): Manifestation, identification and treatment of stuttering in school-age bilingual Cantonese English speaking children, Research Grants Council of Hong Kong (2023-2026)
  • Small equipment grant (HK $624,466): The effects of transcranial electrical stimulation on speech, language and swallowing improvements in people with various communication disorders, The University of Hong Kong, Hong Kong (2022-2025).
  • PhD Fellowship Award, The University of Hong Kong, Hong Kong, 2011.
  • Departmental Reward Scheme for Research Publications in Indexed Journals, The Hong Kong Polytechnic University, Hong Kong (2016-2021)
  • Young Researcher of the Year, Zahedan University of Medical Sciences, Iran, 2007.

  • Identification and treatment of stuttering in bilingual children: The project investigates the manifestation, identification, and treatment of stuttering in Cantonese-English speaking bilinguals.

  • Investigation of executive function skills in people who stutter across different languages.

  • Exploring the effects of neuromodulation (tACS/tDCS) in speech motor control in stuttering and other neurogenic communication disorders. 

Refereed publications
 
  • Carthery-Goulart, M. T., Chu, A., Kong, A. P.-H., & Bakhtiar, M. (2026). Exploring the Effects of a Computerized Naming Intervention Combined with Cerebellar tDCS in Cantonese-Speaking Individuals with Aphasia. Brain Sciences, 16(2), 137.
  • Cheung, C. Y. N., Kong, A. P. H., & Bakhtiar, M. (2025). Individualized connectomic tACS immediately improves oscillatory network with language facilitation in post-stroke aphasia: a feasibility study of a dysfunctome-based targeting approach. Frontiers in Computational Neuroscience, 19, 1635497.
  • Saeedi, S., & Bakhtiar, M. (2025). Assessing the response quality and readability of ChatGPT in stuttering. Journal of Fluency Disorders, 85, Article 106149.
  • Bakhtiar, M., & Johari, K. (2025). The application of non-invasive neuromodulation in stuttering: Current status and future directions. Journal of Fluency Disorders, 106100.
  • Bakhtiar, M., Yeung, T. W. Y., & Choi, A. (2024). The application of neuronavigated rTMS of the supplementary motor area and rhythmic speech training for stuttering intervention. International journal of language & communication disorders, 59(5), 1893-1905.
  • Bakhtiar, M., Carthery-Goulart, M.T., & Kong, A.P.H. (2024). Neuromodulation of impaired spoken discourse. In A.P.H. Kong (Ed.). Spoken discourse impairments in the neurogenic populations: A state-of-the art, contemporary approach. Switzerland: Springer International Publishing. [ISBN: 978-3-031-45189-8]. (Book chapter)
  • Bakhtiar, M. (2024). Manifestation of speech disfluencies in preschool Cantonese-English speaking bilingual children. Clinical Linguistics & Phonetics, 38(12), 1099-1115.
  • Bakhtiar, M., & Eggers, K. (2023). Exogenous verbal response inhibition in adults who do and do not stutter. Journal of Fluency Disorders, 75, 105957. doi: 10.1016/j.jfludis.2022.105957
  • Shao, J., Bakhtiar, M., & Zhang, C. (2022). Impaired Categorical Perception of Speech Sounds Under the Backward Masking Condition in Adults Who Stutter. Journal of Speech, Language, and Hearing Research, 65(7), 2554–2570. https://doi.org/10.1044/2022_jslhr-21-00276
  • Bakhtiar, M., Zhang, Y., & Chen, S. (2022). Rhythm of Cantonese Stuttering Speech. In In Proceedings of Speech Prosody 2022, Lisbon, Portugal.
  • Momenian, M., Lau, K.-Y. D., & Bakhtiar, M. (2022). Developing psycholinguistic norms for action pictures in Cantonese. Applied Neuropsychology: Adult, 1–8. https://doi.org/10.1080/23279095.2022.2037596
  • Zhang, Y., Pattamadilok, C., Lau, D. K. Y., Bakhtiar, M., Yim, L.-Y., Leung, K.-Y., and Zhang, C. (2021). Early auditory ERPs are modulated by alphabetic literacy skills in logographic Chinese readers.Frontiers in Psychology, 12:663166. 
  • Bakhtiar M., Mokhlesin M., Pattamadilok C., Politzer-Ahles S., and Zhang C. (2021). The effect of orthographic transparency on auditory word recognition across the development of reading proficiency. Frontiers in Psychology. 12:691989. 
  • Momenian, M., Bakhtiar, M., Chan, Y. K., Cheung, S. L., & Weekes, B. S. (2021). Picture naming in bilingual and monolingual Chinese speakers: Capturing similarity and variability. Behavior Research Methods, 53(4), 1677-1688.
  • Bakhtiar, M., Shao, J., Cheung M.N. & Zhang, C. (2021). Categorical perception of the speech sounds in adults who stutter. Clinical Linguistics & Phonetics, 35 (6), 560-576.
  • Bakhtiar, M., Wong, M. N., Tsui, E. K. Y., & McNeil, M. R. (2020). Development of the English Listening and Reading Computerized Revised Token Test Into Cantonese: Validity, Reliability, and Sensitivity/Specificity in People With Aphasia and Healthy Controls. Journal of Speech, Language, and Hearing Research, 63, 3743–3759.
  • Bakhtiar, M., Zhang, C., & Ki, S. S. (2019). Impaired processing speed in categorical perception: Speech perception of children who stutter. PloS one, 14(4), e0216124.
  • Nilipour, R., Bakhtiar, M., Momenian, M., & Weekes, B. S. (2017). Object and action picture naming in brain-damaged Persian speakers with aphasia. Aphasiology, 31(4), 388-405.
  • Bakhtiar, M., Jafary, R., & Weekes, B. S. (2017). Aphasia in Persian: Implications for cognitive models of lexical processing. Journal of Neuropsychology, 11(3), 414-435.
  • Bakhtiar, M., Su I-F., Lee H. K., & Weekes, B. S. (2016). Neural correlates of age of acquisition on visual word recognition in Persian. Journal of Neurolinguistics. 39, 1-9.
  • Ahangar, A. A., Bakhtiar, M., Mohammadi, M., & Shakeri Kavaki, M. (2016). The Effect of Syntactic Complexity in Terms of Sentence and Clause Structure on the Stuttering Occurrence of Pre-school Persian Speaking Children. Journal of Modern Rehabilitation, 9(7), 115–124.
  • Bakhtiar, M., & Weekes, B. S. (2015). Lexico-semantic effects on word naming in Persian: Does age of acquisition have an effect? Memory & Cognition, 43, 298-313.
  • Reichel, K., Ademola-Sokoya G., Bakhtiar, M. et al. (2014). Frontiers of cluttering across continents: Research, clinical practices, self-help, and professional preparation. Perspectives on Global Issues in Communication Sciences and Related Disorders, 4, 42-50.
  • Bakhtiar, M., Nilipour, R., & Weekes, B.S. (2013). Predictors of timed picture naming in Persian. Behaviour Research Methods, 45, 834-841.
  • Bakhtiar, M., Ansari, H., & Packman, A. (2011). Translating the Stuttering Severity Instrument (SSI-3) into Persian: Response to Karimi, Nilipour, Shafiei & Howell. Journal of Fluency Disorders, 36, 249-250.
  • Seifpanahi, S., Bakhtiar, M., & Salmalian, T. (2011). Objective vocal parameters in Farsi-speaking adults with Down syndrome. Folia Phoniatrica et Logopaedica, 63, 72-76.
  • Bakhtiar, M., Seifpanahi, S., Ansari, H., Ghanadzade, M., & Packman, A. (2010). Investigation of the reliability of the SSI-3 for preschool Persian-speaking children who stutter. Journal of Fluency Disorders, 35, 87-89.
  • Dehqan, A., Ansari, H., & Bakhtiar, M. (2010). Objective voice analysis of Iranian speakers with normal voices. Journal of Voice, 24, 161-167.
  • Bakhtiar, M., & Packman, A. (2009). Intervention with the Lidcombe Program for a bilingual school-age child who stutters in Iran. Folia Phoniatrica et Logopaedica, 61, 300-304.
  • Seifpanahi, S., Dadkhah, A., Dehqan, A., Bakhtiar, M., & Salmalian, T. (2008). Motor control of speaking rate and oral diadochokinesis in hearing-impaired Farsi speakers. Logopedics Phoniatrics Vocology, 33, 153-159.
  • Dehqan, A., Bakhtiar, M., Panahi, S.S., & Ashayeri, H. (2008). Relationship between stuttering severity in children and their mother's speaking rate Sao Paulo Medical Journal, 126, 29-33.
  • Bakhtiar, M., Abad Ali, D.A., & Sadegh, S.P.M. (2007). Nonword repetition ability of children who do and do not stutter and covert repair hypothesis. Indian Journal of Medical Sciences, 61, 462-470.
  •  

  • Guest editor of the Brain Sciences for special issues on Latest Research on the Treatments of Speech and Language Disorders https://www.mdpi.com/journal/brainsci/special_issues/92MLE14L4T
  • Associate editor of Speech, Language and Hearing, 2022-2024.
  • Editorial board member of the Journal of Fluency Disorders, 2022-present
  • Member of the Society for the Neurobiology of Language 2026-2027
  • Member of World Stuttering & Cluttering Organization 2024-2025
  • Expert Member of International Fluency Association (IFA), 2022-2024
  • Review Editor in language sciences: Frontiers in Psychology, 2021-2024.
  • Ad-hoc reviewer: Journal of Fluency disorders, Brain communications, Journal of Speech, Language and Hearing Research, Plos One, Frontiers in Psychology, Behaviour Research Methods, Journal of Psycholinguistic Research, etc.

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