REVIEW 1 major objections 6 minor 41 references
Implicit Causality-biases in humans and LLMs as a tool for benchmarking LLM discourse capabilities
T0 review · 1 major / 6 minor · reviewed 2026-08-10 · deepseek-v4-flash
Pith's one-line read The paper argues that none of ten mid-size open-weight LLMs reproduces the full trio of human implicit-causality biases — coreference, coherence, and referring-expression form — and that the coreference biases seen in some larger models…
desk verdict First multi-level implicit causality benchmark for LLMs; the negative story is mostly believable, but the referring-form null depends on an unvalidated constrained decoding trick. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The mechanism under test is a three-level cascade of discourse expectations associated with implicit-causality verbs: level 1 predicts a coherence relation (explanation vs. consequence), level 2 predicts the next-mention referent given that relation, and level 3 predicts the morpho-syntactic form of the referring expression given the referent. The benchmark operationalizes the cascade as four experiments: a coreference continuation task with weil and sodass prompts (Experiment 1), a coherence-relation annotation task after comma prompts (Experiment 2), and two forced-reference-style tasks measuring referring-expression form after weil and sodass (Experiments 3 and 4). LLM continuations are generated with diverse beam search, and the forced-reference tasks are emulated by constraining the first generated token to a gender-congruent personal pronoun, name, or demonstrative; human gold-standard data from the same prompt designs are re-annotated with the same automatic pipeline for comparison.
What would settle it
A reader could run Experiment 3 again with free generation followed by a post-hoc filter that keeps only continuations whose first referring expression is a gender-congruent personal pronoun, name, or demonstrative. If a human-like form bias (more pronouns for bias-congruent objects than for bias-incongruent objects) emerges in that filtered set, the paper's null result for referring-expression form would be shown to depend on the constrained decoding rather than on the models' discourse competence.
Extended reading notes
Core claim
The paper's central claim is that, across ten models from the GPT-2, mGPT, XGLM, and German BLOOM families, none exhibits human-like causal discourse when coherence and referring-expression form are considered together with coreference. In Experiment 1, only German BLOOM 6.4B shows a statistically significant human-like I-Caus coreference bias after weil 'because'; nearly all models show an I-Cons bias after sodass 'and so', but weaker than the human bias and shifted toward the object argument. In Experiment 2, no model produces explanations at a rate above 50%, and temporal relations dominate. In Experiments 3 and 4, every model prefers pronouns for subject coreference, but none shows the human pattern in which bias-congruent objects receive more pronouns than bias-incongruent objects. The paper concludes that a model can display coreference-like preferences without the coherence and form biases that form an integrated discourse-expectation system in humans.
Load-bearing premise
The load-bearing premise is that forcing the first word after the prompt to be a gender-matching pronoun, name, or demonstrative produces the same kind of continuation a human would write when asked to refer to a particular person; if this forcing changes how naturally pronouns versus names are used, the finding that models show no form bias could be a measurement artifact rather than a real deficit.
Editorial extensions
If this is right
- Coreference-only tests of LLMs overestimate their discourse competence: a model can pass the coreference-bias test while failing on coherence and referring-expression form.
- The coherence experiment provides a sharp behavioral probe: no tested mid-size model produced explanations above 50 percent, whereas humans produced around 80 percent after comma prompts, so this single measure separates human from model behavior cleanly.
- The I-Cons bias after 'and so' is more robust and less noisy than the I-Caus bias after 'because' across models, suggesting that these models handle consequentiality better than explanation-oriented causality.
- Applying the same four-experiment benchmark to larger, instruction-tuned, or closed models would show whether the missing biases emerge with scale or alignment training, and whether ChatGPT-like strong coreference behavior is accompanied by the coherence and form biases.
- The hierarchical ordering of the three biases in humans predicts that models that lack the coherence and coreference biases will also lack the form bias, and the observed pattern is consistent with that ordering.
Reading between the lines
- We infer that the absence of explanation bias may partly reflect corpus statistics, since causal relations are often implicit in text while temporal relations are explicitly marked; prompting with full stops instead of commas, or probing with implicit-discourse annotations, would test this.
- The constrained-decoding null result for form bias could be checked with a free-generation control: generate without constraints, then keep only continuations whose first referring expression is a pronoun, name, or demonstrative, and re-run the analysis.
- The models' tendency toward female-argument coreference, opposite to the male bias often reported for LLMs, suggests that implicit-causality prompts engage gender dynamics differently from stereotype-heavy tasks; this deserves direct study.
- Because I-Cons performance is stronger than I-Caus performance, the benchmark offers an empirical route to separating formal-linguistic competence from functional-causal competence in models, a distinction the paper raises in its discussion.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper probes ten mid-size, open-weight, non-instruction-tuned LLMs (German GPT-2, German BLOOM 350M/1.5B/6.4B, mGPT, and XGLM 0.564B/1.7B/2.9B/4.5B/7.5B) for three Implicit Causality (IC) discourse biases that are well-established in human psycholinguistic experiments: next-mention coreference bias (Experiment 1), explanation vs. other coherence relations (Experiment 2), and anaphoric form choice under forced reference (Experiments 3 and 4). Human gold-standard data come from the authors' earlier studies (Solstad and Bott 2022 for coreference and coherence; Bott and Solstad 2023 for referring forms). The central empirical findings are negative: none of the models shows the full human trio of biases. Specifically, only German BLOOM 6.4B exhibits a significant human-like I-Caus coreference verb-class effect; no model shows an explanation bias above 50%; and no model shows the human-like modulation of referring-expression form by bias congruency, although most models reproduce the general human preference for simpler forms for subject reference. The paper proposes this triad as a discourse benchmark, arguing that apparent coreference sensitivity in LLMs can exist without human-like causal discourse understanding.
Significance. If the findings survive the methodological concerns raised below, the paper makes a useful contribution: it is one of the few studies to evaluate IC in LLMs beyond the coreference bias, and it provides a concrete, multi-level benchmark that later work can apply to larger or instruction-tuned models. The authors also make several methodologically commendable choices: they use the same automatic annotation pipeline for human and LLM data where possible, report mixed-effects regression and bootstrap analyses, and run multiple models from the same family to probe size effects. The three-level model (relation -> referent -> form) is a clear and plausible way to structure the benchmark. However, the validity of the benchmark, and in particular the claim that no LLM exhibits the referring-expression form bias, currently rests on an unvalidated constrained-decoding emulation and on moderate-quality automatic annotation with substantial data exclusion in Experiment 2. These are not fatal to the coreference or coherence results per se, but they are load-bearing for the strongest negative claims.
major comments (1)
minor comments (6)
- [Sections 2-4] There is a missing Section 3: the text jumps from Section 2 to a numbered but empty '3.' and then to '4. Language Model Setup'. This should be fixed.
- [Sections 6-9] The papers contains numerous typos and small errors, e.g., 'constitues', 'perfomance', 'Or focus', 'futher', 'seperate', 'allmost', 'proported' (for 'purported'), and 'dependency' (for 'dependencies'). A careful copyedit is needed.
- [Section 6.2] The sentence 'yielding κ = .85 and κ = .996 for coreference labeling in experiments 1 and 2, respectively' is confusing: Experiment 2 is about coherence relations, not coreference. Please clarify which annotations were compared in each experiment.
- [Sections 8 and 9] The full statistical results for Experiments 3 and 4 are not reported. Only selected models are plotted, and no table gives the regression coefficients, standard errors, and p-values for all ten models. Since the central claim is that all models fail to show the form bias, full results should be provided in a table or supplementary material.
- [Section 8.1] The exact prompts and the complete list of allowed token sets for the constrained decoding are not fully specified. The paper should list the exact set of allowed first tokens for each condition (which names, which pronoun forms, and which demonstrative forms) so that the experiments are reproducible.
- [Section 6.3] The OSF repository is described as 'not yet published'. For a benchmark paper, data, code, and model outputs should be made available with the manuscript, or at least a stable anonymized repository should be provided for review.
Circularity Check
No significant circularity: the paper benchmarks LLM outputs against independent human behavioral data; self-citations are empirical gold standards, not premises that make the conclusions equivalent to the inputs.
full rationale
This is an empirical comparison study rather than a derivation. The human gold-standard datasets (Solstad and Bott 2022; Bott and Solstad 2023) are self-citations, but they are independent behavioral measurements collected before and outside the LLM experiments, and the same Implicit Causality biases are corroborated by a large external literature (e.g., Garvey and Caramazza 1974; Kehler et al. 2008; Hartshorne et al. 2015; Weatherford and Arnold 2021). No parameter is fitted to a subset of LLM outputs and then renamed as a prediction; the regression models are descriptive comparisons of human and model proportions. The constrained beam-search emulation of the forced-reference task (Section 8.1) restricts the first-token candidate set, but the outcome variable (proportion of personal pronouns) is not fixed by that constraint and varies across models and conditions, so the null form-bias result is not forced by construction. That emulation is a methodological validity concern about task comparability, not a circular step. The paper's negative conclusions are thus not equivalent to its inputs: they depend on the actual generated continuations, not on restating the human gold standard. Self-citations appear frequently, but they function as independently collected comparison data and are load-bearing only in the ordinary sense that any benchmark needs a reference point.
Assumptions & free parameters
free parameters (3)
- diverse beam search hyperparameters =
beam size=10, beam group size=10, diversity penalty lambda=0.6
- constrained decoding form set (Exp 3/4) =
personal pronouns (er/sie), proper names, demonstratives (dieser/diese)
- name selection threshold =
5% gender-incongruent anaphora cutoff
assumptions (4)
- domain assumption Implicit Causality verbs elicit three stable discourse biases in human participants: coreference, coherence, and referential form.
- ad hoc to paper The three-level hierarchical model (relation to referent to form) is the correct characterization of how the biases interact.
- domain assumption Automatic annotation (spaCy parsing, DiMLex connective mapping) provides valid labels for LLM continuations.
- standard math Mixed-effects logistic regression and likelihood ratio tests are appropriate for the repeated-measures design.
Cite this review
Pith. "Pith review of Implicit Causality-biases in humans and LLMs as a tool for benchmarking LLM discourse capabilities." pith.science (2026). https://pith.science/paper/LPAXLAZH
@misc{pith2026250112980,
author = {Pith},
title = {Pith review of: Implicit Causality-biases in humans and LLMs as a tool for benchmarking LLM discourse capabilities},
year = {2026},
howpublished = {\url{https://pith.science/paper/LPAXLAZH}},
note = {Machine review of arXiv:2501.12980}
}
read the original abstract
In this paper, we compare data generated with mono- and multilingual LLMs spanning a range of model sizes with data provided by human participants in an experimental setting investigating well-established discourse biases. Beyond the comparison as such, we aim to develop a benchmark to assess the capabilities of LLMs with discourse biases as a robust proxy for more general discourse understanding capabilities. More specifically, we investigated Implicit Causality verbs, for which psycholinguistic research has found participants to display biases with regard to three phenomena:\ the establishment of (i) coreference relations (Experiment 1), (ii) coherence relations (Experiment 2), and (iii) the use of particular referring expressions (Experiments 3 and 4). With regard to coreference biases we found only the largest monolingual LLM (German Bloom 6.4B) to display more human-like biases. For coherence relation, no LLM displayed the explanation bias usually found for humans. For referring expressions, all LLMs displayed a preference for referring to subject arguments with simpler forms than to objects. However, no bias effect on referring expression was found, as opposed to recent studies investigating human biases.
Figures
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