ABOUT MATTHEW AJIBADE
My research examines salience in phonological processing and representation, with particular attention to how some phonological structures and phonetic details become more prominent than others in speech perception and cognitive organization. I investigate how listeners attend to and weigh phonetic cues in the discrimination of phonological contrasts, and how these weighting patterns shape phonological representation. A central concept in my work is contrastive weighting, the idea that certain phonological contrasts are perceptually prioritized over others within the same linguistic system.
I approach these questions from interconnected perspectives across first-language (L1), second-language (L2), and heritage-language phonological processing. A central part of my work examines how native listeners process and represent phonological contrasts, particularly the phonetic dimensions that become perceptually salient within a language and how linguistic experience shapes patterns of cue weighting and perceptual attention. Building on this foundation, I investigate how listeners approach non-native phonological contrasts in L2 learning, focusing on how prior phonological knowledge conditions speech perception, category formation, and the acquisition of new sound systems. Extending these questions to heritage-language contexts, I explore how phonological structures and phonetic details are maintained, reorganized, or weakened across generations in the diaspora, and what these patterns reveal about interrupted exposure, intergenerational transmission, and long-term phonological representation.
A central focus of my research is Yoruba, Igbo, and Akan, major languages of West Africa that also play significant roles in the linguistic and cultural life of the African diaspora. Using experimental and mixed-methods approaches that combine qualitative and quantitative methodologies, I investigate phonological perception, cue weighting, and cross-language speech processing. My dissertation, supported by the NFMLTA-NCOLCTL Research Award, examined the perception of Yoruba labial-velar stops and contributes empirical and theoretical insights to models of speech perception and phonological learning, including the Perceptual Assimilation Model (PAM), Speech Learning Model (SLM), and Second Language Linguistic Perception (L2LP).
In addition to phonological processing and representation, I am interested in the role of technology in the documentation, teaching, and revitalization of African languages. More recently, my work has explored how African phonological structures are represented in Large Language Models (LLMs) and other AI systems, particularly the challenges these technologies face in modeling underrepresented African languages and their phonological systems.
I earned my Ph.D. in Linguistics from Indiana University Bloomington, and I currently serve as a Visiting Lecturer in the African Studies Program at Indiana University Bloomington, where I teach Yoruba language and culture.
Research Interests
General Linguistics, Phonetics-Phonology, Phonological Acquisition, Labial-velars,
L2 & Heritage Phonology, African Languages and Linguistics, African Language Pedagogy
Ajibade, M., Amoniyan, O., & Ogunya, O. (2026). Implementing AI in African language instruction: Practical ideas and strategies. Journal of African Language Teachers Association (JALTA), 13, 53-73.
Ajibade, Matthew (2025). Heritage perceptual phonological advantage over non-native listeners is not a universal phenomenon. In Aditya, Yedetore, Rebecca D. Bonney, & Yuanyuan Zhang (eds.), BUCLD 49: Proceedings of the 49th Annual Boston University Conference on Language Development, (35-47). Somerville, MA: Cascadilla Press.
May 22, 2026. Gradient effects of early phonological experience on Yoruba labial-velar stop perception. 57th Annual Conference on African Linguistics (ACAL 57), University of Buffalo.
April 2026. Ajibade, Matthew. Ìmúlò èdè Yorùbá l’Amẹ́ríkà: Ìtúnṣe sílábọ́ọ̀sì àti ìdàgbàsókè àkòrí tó bá àìní akẹ́kọ̀ọ́ mu [Yoruba Language Use in America: Syllabus Revision and the Development of Student-Centered Topics]. The 29th Annual African Language Teachers Association (ALTA) Conference, Princeton University, New Jersey (April 9-11, 2026)
April 2026 Ajibade, Matthew, Beatrice Okelo, Ugonna Ahumibe, Nicholas Agyekum. Artificial grammar, real lessons: Mapping AI errors in African languages for pedagogy and model improvement. The 29th Annual African Language Teachers Association (ALTA) Conference, Princeton University, New Jersey (April 9-11, 2026)
Ajibade, Matthew & Bonney, Rebecca D. (2026, February 27-28). African Languages and the Expansion of Heritage Phonology Research. Fifth International Conference on Heritage/Community Languages. Los Angeles: UCLA
Ajibade, Matthew. (2026, January 8-11). Early input and the uneven acquisition of phonological contrasts. [Oral Presentation]. 2026 LSA Annual Meeting. New Orleans, Louisiana.
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Lab Membership
I am a member of the Second Language Psycholinguistics Lab and the Phonetics & Phonology reading (Phlegme) group.