REVIEW 5 major objections 5 minor 26 references
Analyzing the Sensitivity of Vision Language Models in Visual Question Answering
T0 review · 5 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash
Pith's one-line read Adding answer-preserving modifiers to visual questions consistently reduces accuracy in three current vision-language models.
desk verdict Small, honest empirical study: adding answer-preserving modifiers to VQA questions reliably drops a few points of accuracy on three closed VLMs; the central claim is plausible but the AMT verification and GPT-4o self-judging need scrutiny. 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 load-bearing machinery is Grice's cooperative principle and its four maxims (quality, quantity, relation, manner), used to define why answer-preserving modifiers should be harmless to a robust listener. Operationally, the study rests on a three-step pipeline: a vision-language model generates modified questions; crowdworkers verify that the modification preserves the original answer; and paired significance tests—McNemar's exact test for dichotomous yes/no and numeric outcomes, Wilcoxon signed-rank for open-ended outcomes—compare each model's accuracy before and after modification. The verification step picks out the subset of modified questions for which the only plausible cause of an accuracy drop is the model's handling of the modifier itself.
What would settle it
Run a second human panel on the same verified answer-preserving modified questions and compare human accuracy on original versus modified questions; if the human drop is as large as the VLM drop, the effect is linguistic ambiguity rather than a VLM-specific limitation. Alternatively, a large valid sample of one modifier type that produces no accuracy drop in any of the three models would falsify the paper's claim of consistent degradation.
Extended reading notes
Core claim
The central claim is stated in the abstract and in Section 3.2.1: there is a consistent performance degradation in the presence of modifiers. When an answer-preserving visual or relational modifier is added to a VQA v2.0 question, the three tested vision-language models give worse answers than they give to the original question, for both yes/no and numeric questions evaluated by exact match and open-ended questions scored by an LLM similarity evaluator. Modifiers generated by Gemini-1.5-Flash produce the largest average drops for all three models, while modifiers from Claude-3.5-Sonnet produce the smallest; GPT-4o's yes/no accuracy does not change significantly on questions it modified itself. The paper interprets the pattern as evidence that vision-language models do not share humans' robustness to extra conversational detail, while stopping short of identifying why the drop occurs.
Load-bearing premise
Everything rests on the crowdworker verification that a modified question's correct answer really is unchanged; if that verification is wrong or ambiguous, the reported accuracy drop partly reflects changed ground truth rather than vision-language model sensitivity.
Editorial extensions
If this is right
- If the central claim holds, standard VQA accuracy numbers likely overstate how well vision-language models handle verbose, elaborately phrased questions.
- Modifier generation with human verification is a reusable stress test for comparing model robustness across models and question types.
- Because GPT-4o is stable on its own modifications but degrades on other models' modifications, any single-model evaluation of self-generated perturbations may understate sensitivity.
- The remaining open question—which linguistic properties of modifiers drive the drop—can be addressed by grouping modifiers by attribute type, syntactic position, and length.
Reading between the lines
- A cleaner replication would score open-ended answers with a model other than GPT-4o, since GPT-4o is also one of the evaluated systems and the paper's limitations flag this area as approximate.
- One testable extension is to compare human accuracy on the same verified modified questions; if humans also lose ground, part of the observed drop is ordinary ambiguity rather than VLM-specific brittleness.
- Another extension is to vary only the syntactic placement or length of the modifier while holding content fixed, which would separate pattern-matching effects from reasoning effects.
- The protocol could be applied to other benchmarks by appending verifiable answer-preserving modifiers, creating a robustness split that standard accuracy does not expose.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper investigates the sensitivity of three vision-language models (GPT-4o, Gemini-1.5-Flash, and Claude-3.5-Sonnet) to pragmatically marked questions in VQA. The authors add visual or relational modifiers to human-written questions from the VQA v2.0 test set, ask AMT workers to verify that the modified questions preserve the original answer, and then compare each VLM's accuracy on original versus modified questions. They report percentage changes in accuracy for 500 yes/no and numeric questions and 500 open-ended questions, and claim a consistent performance degradation when modifiers are added, with Gemini-generated modifiers being the hardest and Claude-generated modifiers the easiest for all tested models.
Significance. If the claimed effect is robust, this is a useful behavioral probe for VLM robustness, connecting Gricean pragmatics to multimodal question answering and providing a reproducible protocol for generating answer-preserving perturbations. The paper's strengths include the use of a standard benchmark with exact ground truth for closed-form questions, a three-model generation-and-evaluation design, an AMT verification step, and paired significance tests. However, the central claim is not yet established because key verification details and baseline statistics are omitted, and the open-ended evaluation uses one of the tested models as the judge. The idea is testable and the main concerns are addressable with additional analysis, but the current reporting gaps prevent a firm conclusion.
major comments (5)
- [Section 3.2 and Appendix B] The answer-preservation filter is the load-bearing step for the paper's central claim, but its implementation is under-specified. The HIT shows workers the original question, the original answer, and the modified question, and asks 'Is the same answer correct for Q2?'; this anchoring can lead workers to confirm the original answer even when the modifier introduces a visually false or ambiguous premise (e.g., a color or location that does not match the image). The manuscript does not report the agreement rule (e.g., 2 of 3 or 3 of 3), the number or rate of rejected modifications, or the distribution of modifier categories, and it does not provide free-form human answers to the modified questions on a validation subset. Without such details, the accuracy drops in Tables 1 and 2 could partly reflect changed ground truth rather than VLM sensitivity. Please report the agreement statistics and validate the protocol by collecting independent open answers to a sample of modified questions.
- [Tables 1 and 2] The results tables report only percentage change in accuracy, without baseline accuracies, raw counts, confidence intervals, or per-cell p-values. Since the interpretation of a percentage change depends on the original accuracy, and since the paper's 'consistent degradation' claim rests on the pattern across 18 cells per table, the authors should report original and modified accuracy (or raw counts) for every model/modifier combination, together with 95% confidence intervals and the exact test statistic and p-value for each cell. This is necessary to assess whether negative or near-zero values (e.g., GPT-4o on Claude-3.5-Sonnet visual modifiers in Table 1: -0.26%) undermine the consistency claim.
- [Section 3.2 and Table 2] Open-ended answers are scored by GPT-4o similarity, and GPT-4o is one of the three models being evaluated. This introduces a potential evaluation bias for the GPT-4o rows in Table 2 that is not addressed beyond the general statement in Limitations item 3. The authors should either evaluate open-ended answers with a judge that is not among the three tested models (a different LLM or human raters) or report a sensitivity analysis showing that the Table 2 pattern is unchanged when the similarity scores are produced by another model.
- [Section 3.2.1] The sample description is internally inconsistent. The text states that questions were selected so that 'we had an equal number of instances corresponding to each question type (there are 55 question types)', but then says the sample consists of 500 yes/no and numeric questions and 500 open-ended questions; 1000 questions cannot be divided equally among 55 types. Please specify the exact sampling strata, counts per type, and the split between yes/no and numeric questions, since this affects the generalizability of the headline result.
- [Section 3.2.1 and Abstract] The abstract's claim that VLMs 'consistently diminish' with modifiers is stronger than the evidence reported in the manuscript. The text itself says 'in almost all cases' and 'in most cases' for significance, and Table 1 contains a negative value (GPT-4o with Claude-3.5-Sonnet visual modifiers, -0.26%). Please state explicitly which cells are not significant and which are inconsistent with the degradation pattern, and adjust the abstract and conclusion to match the qualified results.
minor comments (5)
- [Section 3] The phrase 'maximum of quality' should be 'maxim of quality', and the maxims should be introduced with consistent terminology throughout.
- [Section 3.2.1] There is a typo: 'GTP-4o' should be 'GPT-4o' in the discussion of self-modified questions.
- [Figure 2] The workflow figure is difficult to read; in particular, the labels 'Wrong Answer' and 'Correct Answer' under the VLM boxes are unclear and should be connected explicitly to the evaluation step.
- [Section 5] Limitations item 2 appropriately notes possible bias in self-modified questions, but the paper should also report whether fresh sessions or API-level context isolation were used for the inference phase, not just for generation.
- [General] The manuscript does not include a data or code availability statement; given the reliance on a sampled subset of VQA v2.0 and generated modifiers, releasing the sampled question IDs, the generated modified questions, and the AMT verification outcomes would substantially aid reproducibility.
Circularity Check
No construction-level circularity; the central yes/no and numeric results are anchored to VQA v2.0 ground truth and AMT verification, though GPT-4o self-scoring and self-modified questions add minor self-referential bias.
full rationale
The derivation chain is: human questions -> VLM-generated modifiers -> AMT verification that the same answer is correct -> evaluate VLMs against VQA v2.0 ground truth for yes/no and numeric questions -> report % change in accuracy. For this half of the data, correctness is defined by external VQA v2.0 ground truth, not by any fitted parameter, self-citation, or definitional identity. Asking a VLM to generate modifiers that preserve the answer and then filtering those modifiers through AMT does not make the measured accuracy drop true by construction, because the drop is measured against external labels. The self-citation to Britton et al. (2022) in Section 2 is related work and is not load-bearing. Two acknowledged self-referential edges exist: Limitations item 2 notes possible context leakage for self-modified questions, and Section 3.2.1 plus Limitations item 3 use GPT-4o to score open-ended answer similarity even though GPT-4o is one of the evaluated models. These are measurement-bias risks, not definitional circularity: the open-ended scores could be biased without making any equation tautological. No fitted parameter is renamed as a prediction, and no uniqueness theorem is imported from the authors' prior work. The claim is therefore self-contained against external benchmarks; score 2 reflects the minor self-evaluation and self-modification edges rather than a circular derivation.
Assumptions & free parameters
assumptions (5)
- domain assumption Grice's maxims and the cooperative principle accurately model cognitive burden in task-oriented human-AI conversation.
- domain assumption Original human-crafted VQA v2.0 questions satisfy Grice's maxims.
- domain assumption AMT workers' judgments that the same answer holds for modified questions are accurate.
- domain assumption VQA v2.0 ground-truth answers provide a reliable exact-match target for yes/no and numeric questions.
- domain assumption VLM API outputs are representative of the models and stable, with no uncontrolled context leakage between question-generation and answering.
Cite this review
Pith. "Pith review of Analyzing the Sensitivity of Vision Language Models in Visual Question Answering." pith.science (2026). https://pith.science/paper/NCW23S7J
@misc{pith2026250721335,
author = {Pith},
title = {Pith review of: Analyzing the Sensitivity of Vision Language Models in Visual Question Answering},
year = {2026},
howpublished = {\url{https://pith.science/paper/NCW23S7J}},
note = {Machine review of arXiv:2507.21335}
}
read the original abstract
We can think of Visual Question Answering as a (multimodal) conversation between a human and an AI system. Here, we explore the sensitivity of Vision Language Models (VLMs) through the lens of cooperative principles of conversation proposed by Grice. Specifically, even when Grice's maxims of conversation are flouted, humans typically do not have much difficulty in understanding the conversation even though it requires more cognitive effort. Here, we study if VLMs are capable of handling violations to Grice's maxims in a manner that is similar to humans. Specifically, we add modifiers to human-crafted questions and analyze the response of VLMs to these modifiers. We use three state-of-the-art VLMs in our study, namely, GPT-4o, Claude-3.5-Sonnet and Gemini-1.5-Flash on questions from the VQA v2.0 dataset. Our initial results seem to indicate that the performance of VLMs consistently diminish with the addition of modifiers which indicates our approach as a promising direction to understand the limitations of VLMs.
Figures
Reference graph
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Reviewed August 6, 2026 · model on record in the stance chip above.
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