Investigating Code-Switching and Phonological Transfer in Multilingual Urban Speech: A Sociolinguistic and Phonetic Analysis of Nigerian English and Yoruba.

Project Abstract

This study examines how code-switching and phonological transfer manifest in multilingual urban speech, focusing on Nigerian English and Yoruba within Lagos sociolinguistic landscapes. Drawing on a mixed-methods design, the research integrates quantitative sociolinguistic metrics with qualitative phonetic analyses to illuminate when and why speakers switch between Nigerian English and Yoruba, and how phonemes, prosody, intonation, and rhythm are influenced across languages in real-world discourse. Data were collected from 60 urban speakers stratified by age, gender, education, and occupation, through spontaneous conversational interviews, ethnographic observation, and elicitation tasks designed to elicit natural code-switching and phonological variation in controlled and unconstrained settings. The study employs labeled data for intra-speaker and inter-speaker variation, enabling robust examination of code-switching rates, code-switching style-shifting, and language domain negotiations (home, work, public spaces). Phonological analyses utilize acoustic measurements (F0, duration, spectral moments) and articulatory patterns to detect transfer processes, including segmental substitutions, allophonic adjustments, and prosodic alignment across lexical items from Yoruba and Nigerian English. Theoretical framing integrates Variationist Sociolinguistics, Matrix Language Frame theory, and Phonology-Prosody interfaces to explain the social meaning and cognitive underpinnings of switching behavior and phonetic assimilation. Key findings anticipate nuanced interactions between social identity markers (ethnic affiliation, age cohort, social prestige) and linguistic choices, with higher propensity for Yoruba segments in informal domains and Nigerian English in formal or technocratic contexts. The research anticipates illustrating bidirectional transfer phenomena, where Yoruba phonotactics influence Nigerian English phonology in loanword adaptation, while Nigerian English phonology shapes Yoruba intonation and segmental realization in bilingual contexts. The study also probes phenomenon of phonological convergence, wherein prolonged bilingual exposure leads to gradual alignment of phonetic inventories, and examines the role of language ideologies, attitudes, and perceived linguistic legitimacy in shaping code-switching strategies. Data analyses apply mixed-effects modeling to quantify the influence of social variables on switching frequency and phonetic transfer, complemented by qualitative discourse analysis to interpret conversational dynamics and negotiation of linguistic identities. The implications extend to improving communication strategies in multilingual urban settings, informing language education policies for bilingual literacy, and contributing to theoretical models of multilingual phonology that account for social-indexical meaning and dynamic speech repertoires. Ethical considerations address participant consent, privacy, and culturally sensitive representation of Yoruba-speaking communities. The study contributes to a deeper understanding of how urban multilingualism operates at the intersection of social structure, language prestige, and the cognitive architecture of multilingual speech production.

Project Overview

What This Project Is About

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A plain-language overview of how people switch between languages in daily speech and how sounds from one language influence another. The project looks at Nigerian English and Yoruba in city settings to see when and why speakers mix languages and how this affects pronunciation. It uses easy observations and simple analysis to explain patterns you can hear in real conversations.

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The Problem It Addresses

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Many multilingual speakers blend languages without a clear rule, which can confuse both learners and teachers. There is also limited practical understanding of how pronunciation changes during code-switching, and how this affects perceptions of competence and identity. The project aims to fill these gaps with clear, accessible findings.

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Objectives of the Project

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1. Describe how often code-switching occurs between Nigerian English and Yoruba in everyday speech.
2. Identify which sounds in Yoruba and English influence each other during switching.
3. Explain social factors (like topic, setting, and speaker background) that influence switching.
4. Provide simple guidelines for teachers and learners about pronunciation in multilingual contexts.
5. Present findings in a way that non-specialists can understand.

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What You Will Do Step by Step

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1. Review simple literature to see what is already known about code-switching and phonology in these languages.
2. Record short, natural conversations in urban Nigerian settings.
3. Transcribe what speakers say and note when language switches occur.
4. Listen for pronunciation changes and map them to the language being switched from or to.
5. Organize data by context (topic, location, speakers).
6. Summarize patterns in an easy-to-read format with examples.
7. Discuss what the findings mean for language learners and educators.
8. Suggest practical tips for improving pronunciation in multilingual settings.

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Expected Outcome

A clear set of everyday patterns showing when code-switching happens and how pronunciation shifts during switching, plus practical recommendations for teaching and learning in multilingual contexts.