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arXiv · 2503.00258

Decoupling Content and Expression: Two-Dimensional Detection of AI-Generated Text

Guangsheng Bao·Lihua Rong·Yanbin Zhao·Qiji Zhou·Yue Zhang
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Abstract

The wide usage of LLMs raises critical requirements on detecting AI participation in texts. Existing studies investigate these detections in scattered contexts, leaving a systematic and unified approach unexplored. In this paper, we present HART, a hierarchical framework of AI risk levels, each corresponding to a detection task. To address these tasks, we propose a novel 2D Detection Method, decoupling a text into content and language expression. Our findings show that content is resistant to surface-level changes, which can serve as a key feature for detection. Experiments demonstrate that 2D method significantly outperforms existing detectors, achieving an AUROC improvement from 0.705 to 0.849 for level-2 detection and from 0.807 to 0.886 for RAID. We release our data and code at https://github.com/baoguangsheng/truth-mirror.

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Guangsheng Bao, Lihua Rong, Yanbin Zhao, Qiji Zhou, Yue Zhang. 2025-03-01. Decoupling Content and Expression: Two-Dimensional Detection of AI-Generated Text. https://arxiv.org/abs/2503.00258

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