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Open research questions in Phonetics and Phonology Research

1,322 gap statements mined from Phonetics and Phonology Research papers in our 7.9M-paper local library, which holds 6,310 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • In contrast, Gurenɛ and Kusaal have been reported to allow the mora to function as the tone‑bearing unit, while the status of the TBU in Buli remains unclear.

    Tone in Mabia Languages: Structure and Processes · 2026 · DOI

  • The study of tone in the Mabia languages is challenging due to the complexity of the tone systems and the lack of research in this area. The variation in tone inventory, tone classes, and polarity across the Mabia languages poses a challenge for researchers.

    Tone in Mabia Languages: Structure and Processes · 2026 · DOI

  • Such a framework should aim to preserve the phonological and morphological integrity of Yoruba names while still accommodating the societal expectations of a global English-speaking audience.

    A Socio-Morphophonemic Reading of Selected Nigerian Yoruba Hip-Hop Artists Stage Names. · 2026 · DOI

  • These findings illuminate the sources of cross-linguistic phonological influence and provide novel insight into the phonetic behavior of a heterogeneous and understudied diasporic community in the US, highlighting the interplay of birthplace and language dominance in heritage bilingual speech.

    Cross-linguistic influence in the speech of Philippines-born and US-born Tagalog–English bilinguals in California · 2026 · DOI

  • Only a few studies have acoustically examined how first language (L1) and second language (L2) speech develops once bilingual speakers return to their L1 environment after a prolonged stay in an L2 context, and not much is known about the long-term effects of L1 re-immersion on both languages in phonetic terms.

    L1 phonetic reversal and L2 phonetic attrition in Japanese–English bilingual returnee children over the course of five years: an acoustic study · 2026 · DOI

  • Future studies should examine the effectiveness of AI-mediated instruction for other phonological aspects, such as vowel quality, consonant clusters, stress, rhythm, and intonation, which also contribute significantly to overall intelligibility.

    Developing an AI-Powered Pronunciation Application to Improve English Pronunciation of Thai ESP Learners · 2025 · DOI

  • Future studies may explore speakers’ mental representations and speech perception, to verify the potentially phonemic nature of this duration alternation for /dz/.

    Inherently Long Consonants in Contemporary Italian Varieties: Regional Variation and Orthographic Effects · 2025 · DOI

  • Specifically, future research should explore the poten‑ tial overlap between the abovementioned monophthong pairs among Mandarin speakers. Future research could explore methods with higher cognitive demands, such as interviews, to elicit L2 speech.

    Accentedness Perception in L2: An Investigation of Thai Monophthong Pronunciation of Chinese Students · 2025 · DOI

  • Since this process was not part of our original research questions and was not included in our statistical model, we present it here only as an anecdotal observation that warrants further investigation. Additional research is needed to determine whether this devoicing pattern is limited to a synchronic variation in the Belo Horizonte dialect or reflects a more widespread phonological development in BP.

    Sound Change and Consonant Devoicing in Word-Final Sibilants: A Study of Brazilian Portuguese Plural Forms · 2025 · DOI

  • Further research is required to study how learning to produce nativelike VOTs in the word-initial position in L2 English influences the perception and production of English stop consonants in other prosodic contexts, and how subsequent influence on L1 Japanese stops might take place in various prosodic contexts.

    L1 Japanese Perceptual Drift in Late Learners of L2 English · 2024 · DOI

  • Lastly, the limitations of the current study cannot go unnoticed. Whether this can simply be explained by the preference of English for closed syllables or linguistically internal reasons goes beyond the scope of the current study. This avenue had not been explored in the context of syllable structure realignment.

    The Role of (Re)Syllabification on Coarticulatory Nasalization: Aerodynamic Evidence from Spanish · 2024 · DOI

  • Although this remains to be tested further with more participants, the follow-up test a month later showed the lasting effects of the training, as proportions of stop-unrelease remained high even in utterance-final position.

    Could You Say [læp˺ tɒp˺]? Acquisition of Unreleased Stops by Advanced French Learners of English Using Spectrograms and Gestures · 2024 · DOI

  • Before concluding, it is worth remarking on some of the limitations of this study. Whereas a scale like [ɾ] > [ɾ̞ ] > [ɹ] > [ɻ] > [ɚ] may capture a general trend, it does not account for what our results indicate, namely, that strengthening and reduc‑ tion are at least partially predicable on the basis of prosodic factors.

    Rhotic Variation in Brazilian Portuguese · 2024 · DOI

  • This trend could point to the possibility of higher L2 proficiency increasing sensitivity to syllable structure, but further research is needed. Future research is needed to disentangle the influence of L2 proficiency in L2 segmentation.

    The Interplay of Syllable Structure and Consonant Sonority in L2 Speech Segmentation · 2024 · DOI

  • Due to high individual variation in emotion production and perception and given the small number of speakers in the experiment, we should bear in mind that our data on the acquisition of the emotional component only show tendencies that could be explored further in a large-scale experiment.

    L1–L2 Influence in Intonation: A Case of Russophone Immigrants in Brazil · 2024 · DOI

  • This finding about tongue position behind and in front of the constriction location for the velar approximant, which has not been reported previously in the phonetics literature, may result from the formation of a wide velar constriction while also being associated with the need to allow continuous airflow through the oral cavity.

    The Effect of Manner of Articulation and Syllable Affiliation on Tongue Configuration for Catalan Stop–Liquid and Liquid–Stop Sequences: An Ultrasound Study · 2024 · DOI

  • Further work is necessary to determine what types of circumstances facilitate accent perception among both normative and heritage speakers: for example, whether accent perception in Lithuanian requires sentential context, or surrounding speech to orient the hearer to the particular pitch properties of the speaker’s voice.

    Maintenance of Lexical Pitch Accent in Heritage Lithuanian: A Study of Perception and Production · 2024 · DOI

  • Few studies have examined global foreign accent (GFA) in bilingual children, and little is known about how GFA changes over time and what factors determine change.

    Language change in Japanese–English bilingual returnee children over the course of five years: Evidence from accent-rating · 2024 · DOI

  • Despite the abundance of research on the relationship between second language (L2) learners’ production and perception of target-language contrasts, the nature and details of this connection remain unclear.

    The relationship between L2 learners’ production and perception of English vowels: The role of native-speaker acoustic patterns in production · 2024 · DOI

  • Although attention control has been proposed as a potentially relevant source of individual variation in speech perception, its association with nonnative segmental discrimination remains underexplored.

    Is self-reported attentional control associated with second language speech perception? · 2026 · DOI

  • The results are inconclusive because RVA tended to be blocked within the word, but less across the word boundary, while PSV was applied to a significantly greater degree across the word boundary than within the word.

    The Link Between Perception and Production in the Laryngeal Processes of Multilingual Speakers · 2025 · DOI

  • Starting with the first finding (discrimination limited to aspiration), pairs with aspi‑ rated phones (characterized by long‑lag VOT) showed high discrimination rates.

    Distributional Learning and Language Activation: Evidence from L3 Spanish Perception Among L1 Korean–L2 English Speakers · 2025 · DOI

  • Future research should address these limitations through several avenues: larger‑ scale studies with balanced groups to enable robust statistical testing; longitudinal designs to clarify developmental trajectories; expanded acoustic analysis beyond VOT; investiga‑ tion of other Mandarin affricate contrasts (alveolo‑palatal, dental) to test generalisability; and more naturalistic production tasks to assess ecological…

    Perception and Production of the Aspiration Contrast in Mandarin Retroflex Affricates [tʂ] and [tʂh] by Adult Spanish Speakers Learning Mandarin Chinese: An Exploratory Study · 2026 · DOI

  • Future research should examine how listeners weight these cues in perception, test their use in other…

    When Pitch Falls Short: Reinforcing Prosodic Boundaries to Signal Focus in Japanese · 2025 · DOI

  • These findings collectively highlight a dynamic, resource-adaptive system in which lexical and language identification processes interact flexibly, setting the stage for further investigation of the precise mechanisms and developmental origins of this interplay.

    Attentional dynamics in lexical and language identification: evidence from eye-tracking · 2026 · DOI

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Open questions raised by papers listed on this page include: (1) Gurenɛ and Kusaal have been reported to allow the mora to function as the tone‑bearing unit, while the status of the TBU in Buli remains unclear (“Tone in Mabia Languages: Structure and Processes”, 2026); (2) Although attention control has been proposed as a potentially relevant source of individual variation in speech perception, its association with nonnative segmental discrimination remains underexplored (“Is self-reported attentional control associated with second language speech…”, 2026); (3) Future studies may explore speakers’ mental representations and speech perception, to verify the potentially phonemic nature of this duration alternation for /dz/ (“Inherently Long Consonants in Contemporary Italian Varieties: Regional…”, 2025); (4) Future research should explore the poten‑ tial overlap between the abovementioned monophthong pairs among Mandarin speakers (“Accentedness Perception in L2: An Investigation of Thai Monophthong…”, 2025); (5) Additional research is needed to determine whether this devoicing pattern is limited to a synchronic variation in the Belo Horizonte dialect or reflects a more widespread phonological development in BP (“Sound Change and Consonant Devoicing in Word-Final Sibilants: A Study of…”, 2025). 1,322 gap statements have been mined from Phonetics and Phonology Research papers in our 7.9M-paper local library, which holds 6,310 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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