While Construction Grammar has proven effective at modelling regional and register variation separately, it has seldom been used to explore the interaction between the two. The present paper fills this gap by applying a Computational Construction Grammar framework to a collection of large English corpora, including two digital registers (written tweets and spoken YouTube transcripts) and five inner-circle varieties (US, UK, Canada, Australia, and New Zealand). We show that constructionist principles successfully capture a range of register- and region-based distinctions across the grammar, and we report the novel finding that both sources lead to systematic, largely independent patterns of variation. Specifically, register effects are more pervasive and concentrated in abstract, high-level constructions, while regional effects are relatively sparser and manifest most prominently in lower-level, surface constructions. To account for these results, we hypothesise that register and regional associations operate along a continuum of constructional ‘salience’: while the former require the explicit learning of variants for communicative functions, the latter begin as products of exposure before they can acquire indexicality. We conclude with implications of our study for a more comprehensive model of variation in the language network, as well as for future endeavours towards intersecting Construction Grammar and sociolinguistic theory.
Morin et al. (2025) studied this question.