@inproceedings{66885,
  abstract     = {{We revisit the under-explored phenomenon of syntactic complexity convergence in dialogue. Extending prior topic-level analyses to full conversations, we examine five human-human datasets and a set of human-LLM dialogues. We integrate and evaluate a multidimensional set of syntactic complexity metrics to quantify structural variation in dialogue. Our analyses reveal robust syntactic complexity convergence across human-human datasets, especially in task-oriented interactions, and statistical tests confirm that these effects are not due to chance. In contrast, human-LLM dialogues show no significant convergence under individual metrics; however, linear-CKA uncovers a distinct cross-metric convergence pattern. Motivated by these differences, we use syntactic complexity as a feature for detecting LLM-involved dialogue, achieving 96\% accuracy. Our classification results demonstrate its potential without relying on likelihood-based signals such as surprisal, which require a language model as the estimator.}},
  author       = {{Wang, Yu and Chen, Yanran and Wang, Yifan and Eger, Steffen and Buschmeier, Hendrik}},
  booktitle    = {{Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing}},
  location     = {{Budapest, Hungary}},
  publisher    = {{ACL}},
  title        = {{{Syntactic complexity convergence in dialogue: Analysis of the phenomenon and application to LLM detection}}},
  year         = {{2026}},
}