Cited by 324Authorship Attribution and ProfilingNatural Language Processing TechniquesTopic Modeling

Automatic Detection of Generated Text is Easiest when Humans are Fooled

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Ippolito, Daphne, Duckworth, Daniel, Callison-Burch, Chris, Eck, Douglas·2020·Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics

Abstract

Recent advancements in neural language modelling make it possible to rapidly generate vast amounts of human-sounding text.The capabilities of humans and automatic discriminators to detect machine-generated text have been a large source of research interest, but humans and machines rely on different cues to make their decisions.Here, we perform careful benchmarking and analysis of three popular sampling-based decoding strategies-topk, nucleus sampling, and untruncated random sampling-and show that improvements in decoding methods have primarily optimized for fooling humans.This comes at the expense of introducing statistical abnormalities that make detection easy for automatic systems.We also show that though both human and automatic detector performance improve with longer excerpt length, even multi-sentence excerpts can fool expert human raters over 30% of the time.Our findings reveal the importance of using both human and automatic detectors to assess the humanness of text generation systems.

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Crossref · 10.18653/v1/2020.acl-main.164

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  • LLMs typically exhibit less diversity in word usage compared to humans.

    “LLMs typically exhibit less diversity in word usage compared to humans [Ippolito et al., 2020;Dugan et al., 2023].”

    From Authorship Attribution in the Era of LLMs: Problems, Methodologies, and Challenges (2025) · cites this paper as Ippolito et al., 2020

    Section 7 (Automatic Detection Results; page not provided) finds that top-k samples concentrate much more probability on common tokens than human writing, consistent with less diverse word usage. But it also says random and nucleus sampling are very similar to human-written text on this measure, so the finding does not support the claim about LLMs generally. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Pre-trained language models, especially BERT-based architectures, have proven effective for learning authorship representation.

    “Pre-trained language models (PTMs), especially BERT-based architectures [Devlin et al., 2019] such as BERT [Ippolito et al., 2020;Fabien et al., 2020;Manolache et al., 2021], Sentence-BERT [Schlicht and de Paula, 2021;Rivera-Soto et al., 2021], and RoBERTa [Huertas-Tato et al., 2022], have proven effective for learning authorship representation.”

    From Authorship Attribution in the Era of LLMs: Problems, Methodologies, and Challenges (2025) · cites this paper as Ippolito et al., 2020

    The Automatic Detection Method section describes fine-tuning BERT to classify text as human- or machine-generated, and Automatic Detection Results reports its accuracy. This supports the effectiveness of BERT for that detection task, but the paper does not evaluate learning representations of individual authorship. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Neural network-based models such as BERT, Radar, and GPT-sentinel can also be applied to human-LLM co-authored text attribution.

    “Additionally, neural networkbased models such as BERT [Ippolito et al., 2020], Radar [Hu et al., 2023], and GPT-sentinel [Chen et al., 2023a] can also be applied.”

    From Authorship Attribution in the Era of LLMs: Problems, Methodologies, and Challenges (2025) · cites this paper as Ippolito et al., 2020

    The Automatic Detection Method section says the authors fine-tuned BERT to label sentences as human- or machine-generated, supporting the BERT portion of the citation. It does not establish that BERT can attribute human–LLM co-authored text; Radar and GPT-sentinel have separate citations and are not judged here. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Exposing evaluators to examples before evaluation enhances their detection capabilities, especially with longer samples.

    “However, exposing evaluators to examples before evaluation enhances their detection capabilities, especially with longer samples.”

    From A Survey on LLM-Generated Text Detection: Necessity, Methods, and Future Directions (2025) · cites this paper as Ippolito et al. 2020

    Section 6 (Human Detection Method; page unavailable) reports that university-student raters shown ten examples before evaluation exceeded 70% accuracy on the longest excerpts, while untrained Mechanical Turk raters hovered around 50%. This supports an association, especially for long samples, but the groups differed as well as their preparation; the paper does not establish that exposure to examples caused the improvement. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Neural network-based detectors, particularly those utilizing BERT, have proven effective in distinguishing between human-written texts and those generated by GPT-2.

    “Neural network-based detectors, particularly those utilizing BERT, have proven effective in distinguishing between human-written texts and those generated by GPT-2 [Ippolito et al., 2020;Liu et al., 2019].”

    From Authorship Attribution in the Era of LLMs: Problems, Methodologies, and Challenges (2025) · cites this paper as Ippolito et al., 2020

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Cites

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1 of the 31 references couldn’t be matched to a known paper.

Research works printed but not linked: 4

  1. Timothy Niven and Hung-Yu Kao. 2019. Probing neu- ral network comprehension of natural language ar- guments. In Proceedings of the 57th Annual Meet- ing of the Association for Computational Linguis- tics, pages 4658-4664, Florence, Italy. Association for Computational Linguistics.
  2. Rico Sennrich, Barry Haddow, and Alexandra Birch. 2016. Neural machine translation of rare words with subword units. In Proceedings of the 54th An- nual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), pages 1715- 1725.
  3. Alan Turing. 1950. Computing machinery and intelligence-am turing. Mind, 59(236):433.
  4. Rowan Zellers, Ari Holtzman, Hannah Rashkin, Yonatan Bisk, Ali Farhadi, Franziska Roesner, and Yejin Choi. 2019. Defending against neural fake news. CoRR, abs/1905.12616. · arXiv

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Authors
Ippolito, D., Duckworth, D., Callison-Burch, C., & Eck, D.
Affiliations
  • University of Pennsylvania (US)
  • Google (United States) (US)
Venue
Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics
Published
2020
Pages
1808-1822
ISSN
0736-587X (ISSN-L)
OpenAlex
W3021153741
Cited by
264
References
31
Citations by year
2026: 39 · 2025: 64 · 2024: 38 · 2023: 63 · 2022: 18 · 2021: 29 · 2020: 13
FWCI
11.75
Type
conference paper
Language
en
Open access
Licence
cc-by
Locations
  • Proceedings of the conference - Association for Computational Linguistics. Meeting (publishedVersion, cc-by)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
Defense Advanced Research Projects Agency (FA8750-19-2-1004, FA8750)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Authorship Attribution and Profiling
  • Physical Sciences › Computer Science › Artificial Intelligence › Natural Language Processing Techniques
  • Physical Sciences › Computer Science › Artificial Intelligence › Topic Modeling
Keywords
AI-generated text detection, decoding strategies, top-k sampling, nucleus sampling, random sampling, human raters, text generation evaluation

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