Back to the Future: The Role of Past and Future Context Predictability in Incremental Language Production

• URL: http://arxiv.org/abs/2511.07752v2
• Date: Thu, 13 Nov 2025 01:24:51 GMT
• Title: Back to the Future: The Role of Past and Future Context Predictability in Incremental Language Production
• Authors: Shiva Upadhye, Richard Futrell,
• Abstract summary: Contextual predictability shapes both the form and choice of words in online language production.<n>We introduce a new principled information-theoretic predictability measure that integrates predictability from both the future and the past context.<n>Our findings illuminate the functional roles of past and future context in how speakers encode and choose words.
• Score: 3.179831861897336
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Contextual predictability shapes both the form and choice of words in online language production. The effects of the predictability of a word given its previous context are generally well-understood in both production and comprehension, but studies of naturalistic production have also revealed a poorly-understood backward predictability effect of a word given its future context, which may be related to future planning. Here, in two studies of naturalistic speech corpora, we investigate backward predictability effects using improved measures and more powerful language models, introducing a new principled and conceptually motivated information-theoretic predictability measure that integrates predictability from both the future and the past context. Our first study revisits classic predictability effects on word duration. Our second study investigates substitution errors within a generative framework that independently models the effects of lexical, contextual, and communicative factors on word choice, while predicting the actual words that surface as speech errors. We find that our proposed conceptually-motivated alternative to backward predictability yields qualitatively similar effects across both studies. Through a fine-grained analysis of substitution errors, we further show that different kinds of errors are suggestive of how speakers prioritize form, meaning, and context-based information during lexical planning. Together, these findings illuminate the functional roles of past and future context in how speakers encode and choose words, offering a bridge between contextual predictability effects and the mechanisms of sentence planning.

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