Rachel K.Y. Tsui, Ph.D.

Postdoctoral fellow

Concordia University


I am currently a postdoctoral fellow at Concordia Infant Research Laboratory. In August 2019, I graduated from the University of Hong Kong with a PhD in Speech and Hearing Sciences specializing in infant speech perception. My PhD thesis focused on the development of lexical tone perception in tone-learning infants. My main research interests are centered around infant language development and bilingualism. I am particularly interested in studying how differences in bilingual experiences (in terms of language environment) influence early language development.

On a side note, I am also multilingual. Growing up in Hong Kong, I speak Cantonese, English, and Mandarin Chinese; I also learned Japanese since teenage years.

Please feel free to contact me if you have any questions relating to my research.

Rachel :)


  • Infant speech perception
  • Bilingualism
  • Early language development
  • Lexical tones and intonation
  • Language dominance


  • PhD in Speech and Hearing Sciences, 2019

    The University of Hong Kong

  • MA in Linguistics, 2014

    The University of Hong Kong

  • BA in Japanese Language and Literature & Linguistics (double-major), 2013

    University of California, Berkeley


The development of gaze following in monolingual and bilingual infants: A multi-lab study

Determining the meanings of words requires language learners to attend to what other people say. However, it behooves a young language …

Impact of language dominance on phonetic transfer in Cantonese–English bilingual language switching

Bilinguals are susceptible to interaction between their two phonetic systems during speech processing. Using a language-switching …



Translation equivalents in bilingual infants’ vocabulary

Exploring the role of translation equivalents in the composition of early bilingual lexicons

Vocabulary development in bilingual infants

Investigating how bilingual infants develop their two lexicons

Development of tone perceptions in Cantonese-learning infants

Investigating whether all lexical tones are treated as equal by native tone-learning infants