Theories of second language acquisition (SLA) have largely assumed that learners can access input and take part in interaction under broadly stable sensory, cognitive, and emotional conditions. Neurodiversity shows that these conditions vary within and across learners, while large language models (LLMs) now mediate much everyday language work. This conceptual article argues that the relationship between regulated access, communicative competence, and AI mediation remains under-theorized in SLA. Through a theoretical synthesis of SLA, neurodiversity scholarship, ecological and distributed cognition, multimodality, and research on AI-mediated communication, it proposes NAIL-C, a neurodiversity-adaptive framework with five interdependent components: Neurodiversity-Centered Design, Adaptive Regulation, Tolerable and Adaptive Input, Learning as Dynamic Alignment, and Multimodality-Adaptive Communicative Competence. The framework treats regulated access as a boundary condition on acquisition, defines communicative competence so that multimodal and variable participation can count as evidence, and positions AI as a potential regulatory scaffold that requires human oversight. NAIL-C complements Universal Design for Learning by offering an SLA-specific account of usable input and competence. The article specifies falsifiable predictions and outlines implications for assessment, pedagogy, and research.
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