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Professor BAKHTIAR, Mehdi

Professor BAKHTIAR, Mehdi

Assistant Professor

Academic Unit of Human Communication, Learning, and Development


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


[javascript protected email address]


(852) 3917 1592


Room 761, Meng Wah Complex

Prospective PhD/ EdD/ MPhil Applications

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

Research Interests:


  • Normal Speech Fluency, Stuttering and other Fluency Disorders
  • Neuromodulation in Neurogenic Communication Disorders
  • Neurocognitive aspects of human communication
  • Development of Speech and Language assessment tests


Teaching areas:

  • SHSC 1033 Introduction to Communication Disorders
  • SHSC 1034 Anatomy & Physiology for Speech and Hearing
  • SHSC 4034 Fluency, Laryngectomy, and Craniofacial Anomalies

  • Young Researcher of the Year, Zahedan University of Medical Sciences, Iran, 2007.
  • 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)

Bilingualism and Stuttering: The project will investigate the manifestation, identification and treament of stuttering in Cantonese-English speaking bilinguals. 


Neuromodulation and Fluency disorders or neurogenic communication disorders : These projects delve into the implementation of neuromodulation techniques, such as transcranial magnetic stimulation (TMS) and/or transcranial electrical stimulation (tES), to improve our understanding of the underlying mechanisms of fluency disorders and other neurogenic communication disorders, as well as their potential for intervention among these clinical population. 


Refereed Journal Articles:


  • Bakhtiar, M., & Eggers, K. (2023). Exogenous verbal response inhibition in adults who do and do not stutter. Journal of Fluency Disorders75, 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 Research65(7), 2554–2570.

  • 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.

  • 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 Methods53(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.

  • Associate Editor: Speech, Language and Hearing, 2022-present
  • Editorial Board Member: Jounral of Fleuncy Disorders,  2022-present
  • Review Editor for Language Sciences: Frontiers in Psychology, 2021-present 
  •  Ad Hoc Reviewer: 
    • Behaviour Research Methods
    • Clinical linguistics and phonetics
    • Folia Phoniatrica et Logopaedica
    • Frontiers in Psychology
    • International Journal of Audiology
    • Journal of Experimental Psychology: Human Perception and Performance
    • Journal of Speech, Language and Hearing Research
    • Journal of Psycholinguistic Research
    • PLOS ONE