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Open research questions in Neurobiology of Language and Bilingualism

491 unresolved questions extracted from the limitations and future-work sections of 2,978 Neurobiology of Language and Bilingualism papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The paper identifies a gap in current research regarding the understanding of the subject island effect and its relationship to syntactic representations and communicative function. It highlights the need for further investigation into the nature of the system of rules and representations that comprises language users' knowledge. The study also notes the lack of understanding of how the subject island effect operates across different constructions.

    Subject islands do not reduce to construction-specific discourse function · 2026 · DOI

  • Investigating the field's core phenomena across a more representative sample of the world's languages, - Continued investigations across a diverse sample of the world's languages to answer how much of our predictive mechanism is tunable, - Examining the trajectory of trials that ended with a voluntary or a disambiguated ORC parse

    Delayed structural prediction for relative clauses: A new argument for learning to parse from Santiago Laxopa Zapotec · 2026 · DOI

  • The paper identifies a gap in our understanding of the mechanisms underlying the preference for associating the dislocated head with a subject position. Prior work has focused primarily on English and English-like languages, leaving a gap in our understanding of relative clause comprehension in other languages. The study aims to fill this gap by investigating the processing of relative clauses in Santiago Laxopa Zapotec.

    Delayed structural prediction for relative clauses: A new argument for learning to parse from Santiago Laxopa Zapotec · 2026 · DOI

  • The paper identifies a gap in the understanding of morphological fusion and its relation to efficient processing. The paper notes that prior work has not fully explained the crosslinguistic generalizations of morphological fusion. The paper aims to fill this gap by proposing an information-theoretic model to explain morphological fusion.

    Toward an information-theoretic model of morphological fusion based on an efficient tradeoff of memory and surprisal · 2026 · DOI

  • The paper identifies a gap in the current understanding of linear asymmetries in sentence grammar, particularly the word-order asymmetry in noun phrases. It notes that prior work has failed to provide a satisfactory account of the absence of rightward movement in noun phrases. The paper seeks to fill this gap by proposing a parsing-based account of the word-order asymmetry.

    Linear asymmetries and incremental parsing · 2026 · DOI

  • The paper identifies a gap in the understanding of how word frequency affects spoken word duration in the context of recent models of the lexicon. It notes that the notion of lexical frequency is challenged by models that do not contain stable, discrete lexical representations.

    Time and thyme again: Connecting English spoken word duration to models of the mental lexicon · 2024 · DOI

  • There is a need to refine the claims and predictions of the good enough processing theory. The paper identifies a gap in the existing research on good enough processing.

    Good enough processing: what have we learned in the 20 years since Ferreira et al. (2002)? · 2024 · DOI

  • The respective contributions of different cognitive processes to verbal fluency are unclear. Prior studies have provided limited evidence for the cognitive architecture of verbal fluency. There is a need for a more refined understanding of the cognitive processes underlying verbal fluency.

    Investigating the cognitive architecture of verbal fluency: evidence from an interference design on 487 controls · 2024 · DOI

  • Future studies should extend this line of inquiry beyond Europe, incorporating populations representing a broader diversity of multilingual experiences and sociolinguistic contexts - Research should include elements such as age of acquisition, language proficiency, frequency of use, language context, minority language status, and the influence of migration, discrimination, and social adversity

    Does Multilingualism Shape Aging Equally Across Populations? · 2026 · DOI

  • Further research is needed to determine the exact nature of the subject island effect, - Research should investigate whether the subject island effect is specific to English or if it is a universal phenomenon, - Future studies should test the subject island effect using different experimental designs and methods

    Subject islands do not reduce to construction-specific discourse function · 2026 · DOI

  • , queen-king and woman-man) is encoded as a shared vector direction in language AI, forming parallelogram geometry, whereas its presence in the human brain remains unknown.

    AI-like parallelogram geometry of word relations in the human neocortex · 2026 · DOI

  • Consequently, it remains unclear whether MD cortices function merely as nonspecific amplifiers of effort or actively encode fine-grained linguistic structures.

    Content-Sensitive Linguistic Representations in the Human Multiple-Demand Network · 2026 · DOI

  • Bilinguals, in particular, remain understudied at the individual level, as neuroimaging has mostly approached them as a group.

    What Transfers Across Brains Is Not What Stays Within Individuals: Evidence from Bilingual Language States · 2026 · DOI

  • Semantic radicals facilitate Chinese word recognition, but how their neural effects are modulated by conceptual scope remains unclear.

    Scope of superordinate categorisation modulates semantic radical effects in Chinese word reading: an ERP study · 2026 · DOI

  • , 2020), yet the extent of this influence remains unclear, specifically in simultaneous bilinguals with two gendered languages.

    Early perceptual effects (or lack thereof) of conflicting grammatical genders: ERP evidence from simultaneous bilinguals · 2026 · DOI

  • L2 accents can hinder comprehension, but their impact on violation processing has not yet been fully clarified.

    The L2 accent effect in the processing of grammatical and phonological violations. A German-Polish ERP study · 2026 · DOI

  • However, the extent of this overlap, and the influence of age and sex remain unclear.

    Overlap in the cerebral processing of language and executive control: an ERP study on the effects of age and sex · 2026 · DOI

  • However, existing evidence is inconsistent regarding the dynamics of prediction updating.

    Dynamic verb-prediction updating as cued by prediction-inconsistent pronouns in Chinese discourse comprehension · 2026 · DOI

  • However, few studies have investigated electrophysiological correlates of proverb processing.

    Electrophysiological responses to proverbs: from neurocognitive mechanisms towards single-participant diagnostics of language processing · 2026 · DOI

  • However, how cross-linguistic structural divergences interact with semantic congruity to shape neurocognitive processing remains poorly understood.

    EFL Learners’ event-related brain responses to verbal argument congruency and cross - linguistic syntactic differences in processing English sentences modulated by proficiency · 2026 · DOI

  • Hyperarticulated clear speech is known to aid this segmentation process but how this benefit interacts with top-down semantic context remains unclear.

    When top-down meets bottom-up: the interaction of semantic context and clear speech in real-time word segmentation · 2026 · DOI

  • Language comprehension involves actively predicting upcoming words, but it remains unclear how the brain responds when predictions are disconfirmed.

    Prediction During Within- and Cross-Language Phrase Comprehension: Evidence from Eye-Tracking · 2026 · DOI

  • However, little is known about their patterns, time course, and association with brain atrophy.

    Patterns and Trajectories of Behavioral and Neuropsychiatric Symptoms in Frontotemporal Dementia and Primary Progressive Aphasia · 2026 · DOI

  • However, little is known about how rapid incoming sequences of hierarchical features are continuously coordinated.

    Hierarchical dynamic coding coordinates speech comprehension in the human brain · 2025 · DOI

  • However, the interplay between conversational presuppositions and cognitive expectations in bilingual contexts-particularly in literary settings-remains under-explored.

    Trouble spots in literary conversation learning: managing bilinguals’ cognitive expectation problems using conversational presupposition theory · 2025 · DOI

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491 open questions have been extracted from the limitations and future-work passages of 2,978 Neurobiology of Language and Bilingualism papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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