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Professor NG, Manwa Lawrence

Professor NG, Manwa Lawrence


Associate Dean (Outreach and Engagement)

Director, Speech Science Laboratory, HKU

Associate Professor

Academic Unit of Human Communication, Learning, and Development


M.A. (Connecticut), M.S. (Illinois State), PhD (Connecticut)


[javascript protected email address]


(852) 3917 1582


Room 759, Meng Wah Complex

Research Expertise

  • Communication Sciences and Disorders
  • Speech and Hearing Sciences

Prospective PhD/ EdD/ MPhil Applications

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

Teaching Areas:

Laryngectomy, Speech Science, Speech Acoustics, Anatomy and  Physiology of Speech and Hearing Mechanism, Research Methodology


Research Interests:

Laryngectomy, Speech Instrumentation, Voice Disorders, Accent Identification, Quantification and Modification, Neuromodulation for Speech Deficits

  • Faculty Outstanding Teaching Award 2011-2012

Active Grants

  1. 32022/06/30-2024/06/29, Seed Funding Programme for Basic Research, University of Hong Kong (202111159064) (PI). “The Application of Artificial Intelligence and Deep Learning in Automatic Assessment of Disordered Voices”, HKD$82,000.00.
  2. 2021/03/22 - 2022/08/31. Education Faculty Research Fund, University of Hong Kong (000250337/24113/10000/100/01) (PI). “How does L1 affect l2 pronunciation? A large-scale quantitative comparison of error patterns associated with L2 English produced by native Mandarin and Cantonese adult ESL speakers”, $147,770.00.
  3. 2020/11/16 - 2021/11/15, Research Integrity Funding Scheme 2020/21, University of Hong Kong (102009994/024113/10000/302/01) (PI). “Developing a Self-Learning Package on Research Integrity”, HKD$49,620.
  4. 2020/07/01 - 2022/08/31. Education Faculty Research Fund, University of Hong Kong (000250337/024113/10000/100/01) (PI). “Effect of Gender, Age and Bolus Viscosity on Acoustics of Normal Swallow”, HKD$46,230.

Refereed Journal Articles (since 2016)


  1. Ng, M., Ng, N., & Siu, B. (in submission). Relationship between IDDSI Flow Test and consistometric measures for consistency classification - an examination of thickened liquids prepared using starch-based and xanthan gum-based thickening agents. Food Hydrocolloids for Health.
  2. Peng, J., Zou, M., Ng, M. L., Tan, J., & Xiang, J. (in submission). Nonsurgical treatment of bilateral vocal fold paralysis - A case study of voice training combined with acupuncture therapy. The Laryngoscope.
  3. Wang, T., Xu, X., Xie, X., & Ng, M. L. (in revision). Probing lexical ambiguity in Chinese characters via their word formations: Convergence of perceived and computed metrics on quantity and relatedness of character senses. Cognitive Science.
  4. Peng, J., Ng, M., Zou, M., Tan, J., & Xie, W. (in submission). A study on the characteristics of consonant phonetic errors in preschool children with functional articulation disorders. Chinese Journal of Rehabilitation Theory and Practice.
  5. Cox, S. R., Huang, T., Chen, W.-R., & Ng, M. L. (2023). An acoustic study of Cantonese alaryngeal speech in different speaking conditions. Journal of the Acoustical Society of America, 153(5), 2973-2984.
    doi: 10.1121/10.0019471
  6. Wang, D., Zhang, Y., Zhang, H., Huo, F., Zhang, L., Yang, Y., Wang, L., Yan, Y., Ng, M., & Yan, N. (2023). Is visual gaze in children with autism spectrum disorder related to sequence of emotion intensity presentation? An eye-tracking study of natural emotion perception processes. Autism Research, 16(5), 1024-1039.
    doi: 10.1002/aur.2918
  7. Liu, J., Du, X., Lu, S., Zhang, Y., Hu, A., Ng, M., Su, R., Wang, L., & Yan, N. (2023). Audio-video database from subacute stroke patients for dysarthric speech intelligence assessment and preliminary analysis. Biomedical Signal Processing and Control, 79, Part 2, 104161.
    doi: 10.1016/j.bspc.2022.104161
  8. Wong, M. N., Baig, F. N., Chan, Y. K., Ng, M., & Zhu, F. F. (2022). Transcranial direct current stimulation over the primary motor cortex improves speech production in post-stroke dysarthric speakers: A pilot study. PLoS One, 17(10), e0275779.
    doi: 10.1371/journal.pone.0275779
  9. Zhu, S., Chong, S., Chen, Y., Wang, T., & Ng, M. (2022). Effect of language on voice quality - An acoustic study of bilingual speakers of Mandarin Chinese and English. Folia Phoniatrica et Logopaedica, 74(6), 421-430.
    doi: 10.1159/000525649
  10. Ng, M., Mak, C., Mak, J., & Xiong, M. (2022). Effect of temperature on consistency of starch- and gum-based thickened liquids for dysphagic individuals. Food Hydrocolloids for Health, 2, 1-7.
    doi: 10.1016/j.fhfh.2022.100076
  11. Chan, H. F., Ng, M., Kim, H., & Kim, D. Y. (2022). Swallowing-related quality of life among oral-feeding Chinese patients of Parkinson’s Disease - A preliminary study using Chinese SWAL-QOL. Disability and Rehabilitation, 44(7), 1077-1083.
    doi: 1080/09638288.2020.1791979
  12. Ng, M. & Lui, H. Y. (2022). Rice congee as an alternative to thickened liquids for patients with swallowing disorders. Journal of Textual Studies, 53(3), 405-416.
    doi: 10.111/JTXS.12673
  13. Ng, M., & Ki, A. (2022). Acoustic characteristics associated with liquid swallowing sounds of different bolus consistencies in young healthy adults. International Journal of Language & Communication Disorders, 57, 552-564.
    doi: 10.1111/1460-6984.12706
  14. Hui, T. F., Cox, S. R., Huang, T., Chen, W.-R., & Ng, M. (2021). The effect of clear speech on Cantonese alaryngeal speakers’ intelligibility. Folia Phoniatrica et Logopaedica, 74(2), 103-111.
    doi: 10.1159/000517676
  15. Wong, L. Y., Ng, M., & Tong, E. T. S. (2021). How accurate are the consistency labels used in Hong Kong? An objective study of consistency of thickened liquids using IDDSI and consistometric measurements. Folia Phoniatrica et Logopaedica, 74(3), 167-175.
    doi: 10.1159/000518480
  16. Ng, M., & Woo, H. K. (2021). Effect of total laryngectomy on vowel production - An acoustic study of vowels produced by alaryngeal speakers of Cantonese. International Journal of Speech-Language Pathology, 23(6), 652-661.
    doi: 10.1080/17549507.2021.1876166
  17. Wang, T., Hong, Y., Wang, Q., Su, R., Ng, M., Xu, J., Wang, L., & Yan, N. (2021). Identification of mild cognitive impairment among Chinese based on multiple spoken tasks. Journal of Alzheimer’s Disease, 82(1), 185-204.
    doi: 10.3233/JAD-201387
  18. Chan, H. F., Ng, M., Rosen, C., & Schneider, S. L. (2021). Cultural adaptation and validation of Speech Handicap Index (SHI): A scoping review. American Journal of Speech-Language Pathology, 30(2), 748-760.
    doi: 10.1044/2020_AJSLP-20-00236
  19. Ng, M. (2021). The use of the Lombard effect in improving alaryngeal speech. Journal of Voice, 35(1), 18-28.
    doi: 10.1016/j.jvoice.20107.007
  20. Wang, Z., Yao, L., Ng, M. L., Chen, Y., & Zhang, W. (2020). Acoustic analysis of Mandarin Chinese vowels produced by young adults. Rehabilitation Medicine, 30(3), 183-191.
    doi: 10.3724/SP.J.1329.2020.03004
  21. He, Y., Qi, S., Wang, L., He, W., Tan, C., Zhang, H., Chen, Y., Ng, M., & Yan, N. (2019). The characteristics of intelligence profile and eye gaze in facial emotion recognition in mild and moderate preschoolers with Autism Spectrum Disorder. Frontiers in Psychiatry, 10, 402.
    doi: 10.3389/fpsyt.2019.00402
  22. Zhang, H., Su, I-F., Chen, F., Ng, M., Wang, L., & Yan, N. (2019). The time course of orthographic and semantic activation in Chinese character recognition: Evidence from ERP study. Language, Cognition and Neuroscience, 35(3), 292-309.
    doi: 10.1080/23273798.2019.1652762
  23. Ng, M., & Tsang, G. (2019). The Lombard effect associated with Chinese male alaryngeal speech. International Journal of Speech-Language Pathology, 21(6), 584-592.
    doi: 10.1080/17549502018.1551932
  24. Ng, M., Tong, E. T.-S., & Yu, K. K. M. (2019). Articulatory contact pressure during bilabial plosive production in esophageal and tracheoesophageal speech. Folia Phoniatrica et Logopaedica, 71(1), 1-6.
    doi: 10.1159/000493344
  25. Wong, M. N., Chan, Y., Ng, M., & Zhu, F. F. (2018). Effects of transcranial direct current stimulation over the Broca's area on tongue twister production. Internationa Journal of Speech-Language Pathology, 1-7.
    doi: 10.1080/17549507.2017.1417480
  26. Ng, M., Yan, N, Chan, V., & Chen, Y., & Lam, P. K. Y. (2018). A volumetric analysis of vocal tract associated with laryngectomees by using acoustic reflection technology. Folia Phoniatrica et Logopaedica, 70, 44-49.
    doi: 10.1159/000486714
  27. Ng, M. & Wong, B. Y. H. (2017). Voice performance in tonal language speakers with glottal insufficiency due to unilateral vocal fold paralysis after injection laryngoplasty: a multidimensional study of Cantonese patients. Hong Kong Medical Journal, 24 (suppl. 2), S42-S44.
  28. Ng, M., Yan, N., Chiu, K. N., & Chen, Y. (2017). Acoustic and electroglottographic characteristics associated with tracheoesophageal speech of Cantonese. Rehabilitation Medicine, 27(5), 5-11.
    doi: 10.3724/SP.J.1329.2017.05000
  29. Ng, M., & Lau, D. (2017). A perceptual and acoustic study of voice gender in prepubertal children. Speech, Language and Hearing, 20(3), 123-129.
    doi: 10.1080/2050571X.2016.1253534
  30. Wong, M. N., Kuruvilla, M., & Ng, M. (2017). Differential effects of increased loudness on tongue kinematics in individuals with PD? Analyses of two cases. Speech, Language, and Hearing, 20(1), 49-56.
    doi: 10.1080/2050571X.2016.1206694
  31. Li, X., To, C. K. S., & Ng, M. (2017). Effects of L1 tone on perception of L2 tone - a study of Mandarin tone learning by native Cantonese children. Bilingualism: Language and Cognition, 20(3), 549-560.
    doi: 10.1017/S1366728916000195
  32. Ng, M. L., Chen, Y., & Wong, S. (2016). Lingual movement during speech production by a speaker of Cantonese with dysarthria - An electromagnetic articulographic study. Rehabilitation Medicine, 26(5), 8-16, 24.
    吴民华、陈暘、王芷琪(2016)。电磁构音图谱仪对神经控制异常性构音障碍粤语患者说话时舌头运动的研究。康复学报,第26卷,第5期,8-16, 24页。
    doi: 10.3724/SP.J.1329.20105008
  33. Jiang, C., McPherson, B., & Ng, M. (2016). Voice onset time of alveolar stop /t/ and realization of unaspirated affricates associated with Mandarin-speaking children with repaired cleft palate. International Journal of Pediatric Otorhinolaryngology, 86, 150-155.
    doi: 10.1016/j.ijporl.2016.03.042
  34. Wong, B. Y.-H., Yu, S.-Y., Ho, W.-K., Wei, W. I., & Ng, M. (2016). Injection laryngoplasty using hyaluronic acid for Chinese patients with unilateral vocal fold paralysis. Speech, Language and Hearing, 19(3), 153-160.
    doi: 10.1080/2050571X.2016.1159407
  35. Jiang, C., Whitehill, T. L., McPherson, B., & Ng, M. (2016). Spectral moment analysis of affricates produced by Putonghua-speaking pre-adolescents with repaired cleft palate. International Journal of Pediatric Otorhinolaryngology, 84, 137-142.
    doi: 10.1016/j.ijporl.2016.01.029
  36. Yu, S., Lee, T., & Ng, M. (2016). Surface electromyographic activity of extrinsic laryngeal muscles in Cantonese tone production. Journal of Signal Processing Systems, 82(2), 287-294.
    doi: 1007/s11265-015-1022-4
  37. Wang, Z., Yu, P., Yan, N., Wang, L., & Ng, M. (2016). Automatic assessment of pathological voice quality using multidimensional acoustic analysis based on the GRBAS scale. Journal of Signal Processing Systems for Signal Image and Video Technology, 82(2), 241-251.
    doi: 10.1007/s11265-015-1016-2

Book Chapters

  1. 吴民华(印制中)。声乐,在《艺术类损伤学》。北京,人民卫生出版社。
    Ng, M. (in press). SInging. In Traumatology of Dancing, Singing, and Music Playing. Beijing, China: People's Medical Publishing House Co. Ltd.
  2. Zhang, H., Chen, F., Yan, N., Wang, L., Su, I. F., Ng, M. L. (2016). The interaction of semantic and orthographic processing during Chinese sinograms recognition: An ERP study. In M. Dong, J. Lin, X. Tang (eds.), Workshop on Chinese Lexical Semantics (pp. 717 - 727). Springer, Cham.
    doi: 10.1007/978-3-319-49508-8_66
  3. Chan, L. K., Bridges, S. M., Doherty, I., Ng, M., Jin, J., Sharma, N., Chan, N. K., & Lai, Y. Y. H. (2016). How do students use mobile devices in problem-based learning? In S. Bridges, L. K. Chan, & C. E. Hmelo-Silver (Eds.), Educational technologies in contextual learning: Research in health professions education (pp. 99-116). New York, NY: Springer
    doi: 10.1007/978-3-319-08275-2_6


Articles in Conference Proceedings (since 2016)

  1. Lian, C., Wang, T., Gu, M., Ng, M. L., Zhu, F., Wang, L., & Yan, N. (2020). Does lexical retrieval deteriorate in patients with mild cognitive impairment? Analysis of brain functional network will tell. In Proceedings of the 21st Annual Conference of the International Speech Communication Association (Interspeech 2020), 111-115. 
    doi: 10.21437/Interspeech.2020-2490
  2. Wang, T., Lian, C., Pan, J., Yan, Q., Zhu, F., Ng, M., Wang, L., & Yan, N. (2019, September). Towards the speech features of mild cognitive impairment: Universal evidence from structured and unstructured connected speech of Chinese. In Proceedings of the 20th Annual Conference of the International Speech Communication Association (Interspeech 2019), 3880-3884.
    doi: 10.21437/Interspeech.2019-2414
  3. Wang, T., Liu, H., Wang, L., Ng, M., Li, H., & Yan, N. (2018, November). Effect of temporal lobe epilepsy on auditory-motor integration for vocal pitch regulation: Evidence from brain functional network analysis. In Proceedings of the 2019 Engineering in Medicine and Biology - Biomedical Engineering Ranging from Wellness to Intensive Care Medicine (EMBC’19), 1282-1288.
    doi: 10.1109/EMBC.2019.8856902
  4. Leung, N., Tong, E., & Ng, M. (2018, October). Vowel characteristics associated with Parkinson’s disease in Cantonese. In Movement Disorders, 33, S756-S757, Hong Kong, China.
    doi: 10.1002/mds.116
  5. Tong, E. T. S. & Ng, M. (2018, October). Effects of expiratory muscle strength training and voice therapy on Parkinsonian speech. In Movement Disorders, 33(2), S179-S180, Hong Kong, China.
    doi: 10.1002/mds.116
  6. Chan, H. F. K., Kim, H., Ng, M., & Kim, D.-Y. (2018, October). Application of Chinese version of SWAL-QOL in Parkinson’s Disease. In Movement Disorders, 33(2), S482-S483, Hong Kong, China.
    doi: 10.1002/mds.116
  7. Ng, M., Xiong, M., & Yan, N. (2018). Production of Cantonese tones using an ingressive airflow. In Proceedings of the 2018 International Conference on Asian Language Processing (IALP 2018), Bandung, Indonesia.
  8. Zhang, W., Gui, X., Wang, T., Ng, M., Yang, F., Wang, L., &Yan, N. (2018). Acoustic features associated with sustained vowel and continuous speech productions by Chinese children with functional articulation disorders. In Proceedings of Interspeech 2018 (pp. 1696-1700).
    doi: 10.21437/Interspeech.2018-1521
  9. Zhang, H., Yan, M., Wang, L., & Ng, M. (2017). Energy distribution analysis and nonlinear dynamical analysis of phonation in patients with Parkinson’s disease. In Proceedings of 2017 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC), pp. 630-635.
  10. Lai, W. W. S., & Ng, M. L. (2017). Perception-production link in English lexical stress acquisition among Hong Kong Cantonese learners of English. In Stem-, Spraak-en Taalpathologie, 22 (Suppl.): 59.
  11. Chang, R. K., & Ng, M. (2017). Differences in speech motor control between bilingual and monolingual speakers - an acoustic study. In Journal of the Acoustical Society of America, 141.5, 3819-3819.
    doi: 10.1121/1.4988463
  12. Tong, E. T. S., Ng, M., & Yan, N. (2016). Impact of Expiratory Muscle Strength Training (EMST) on phonatory performance in Parkinson’s patients. In Movement Disorders, 31(S2), S1-S697.
    doi: 10.1002/mds.26688
  13. Tong, E. T. S., Ng, M., & Yan, N. (2016). Dopaminergic medication effect on speech in Parkinson’s disease: A kinematic study. In Movement Disorders, 31(S2), S1-S697.
    doi: 10.1002/mds.26688
  14. Xie, S., Yan, N., Yu, P, Ng, M. L., Wang, L., & Ji, Z. (2016). Deep neural networks for voice quality assessment based on the GRBAS scale. In Proceedings of the Interspeech 2016 (pp. 2656-2660), San Francisco, USA.
    doi: 10.21437/Interspeech.2016-986
  15. Zhang, H., Chen, F., Yan, N., Wang, L., Shi, F., & Ng, M. L. (2016). The influence of language experience on categorical perception of vowels: Evidence from Mandarin and Korean. In Proceedings of the Interspeech 2016 (pp. 873-877), San Francisco, USA.
    doi: 10.21437/Interspeech.2016-887
  16. Tong, E. T. S., Ng, M., & Yan, N. (2016). The effect of expiratory muscle strength training in Cantonese speaking Parkinson’s disease patients: A pilot study. In Movement Disorders, 31(S1), S12-S100.
    doi: 10.1002/mds.26576
  17. Lai, W. W. S., & Ng, M. L. (2016). Different acoustic cues for emphasis in teaching English word stress to Hong Kong Cantonese ESL learners of different proficiencies. In Proceedings of 7th Tutorial and Research Workshop on Experimental Linguistics (ExLing2016) (pp. 91-94), St. Petersburgh, Russia: International Speech Communication Association.
  18. Ng, M., Lam, K., & Chen, Y. (2016). Perception of whispered Cantonese tones. In Proceedings of the 12th Phonetic Conference of China (PCC2016)(pp. 746-750), Inner Mongolia, China.
  19. Zhang, H., Yan, N., Chen, F., Wang, L., Su, I.-F., Ng, M. (2016). The interaction of semantic and orthographic processing during Chinese sonograms recognition: An ERP study. In Proceedings of the 17th Chinese Lexical Semantics Workshop (CLSW2016), Singapore.

  1. (2016 - present) Associate Editor for the journal of Folia Phoniatrica et Logopaedica
  2. (2009 - present) Honorary Consultant of the New Voice Club of Hong Kong.
  3. (01/2018 - 12/2021) President of the Asia Pacific Society of Speech, Language, and Hearing
  4. (01/2015 -12/2017) Vice President of the Asia Pacific Society of Speech, Language, and Hearing
  5. (2011 - 2021) Council Member for the Asia Pacific Society of Speech, Language, and Hearing

Adjunct Faculty Positions


(09/2022 - present) Adjunct Professor, John G Rangos Sr., School of Health Sciences, Duquense University, Pittsburgh, USA


(05/2019 - present) Distinguished Visiting Professor, School of Foreign Languages, Nanjing Medical University, Nanjing, China


(05/2016 - present) Visiting Professor, School of Stomatology, Nanjing Medical University, Nanjing, China