arXiv AI

Probing Negation Understanding in Vision-Language Models With Object Attention

The paper investigates how vision‑language models (VLMs) handle negation by comparing their attention patterns to human gaze when processing affirmative versus negated statements. Using synthetic and realistic datasets, the authors find that most VLMs do not mimic human-like attention and rely on mechanisms beyond attention, with PaliGemma2‑3B shifting focus to alternatives under negation and LLaVA‑1.5‑7B showing a left‑side spatial bias. The study highlights a performance gap between affirmative and negated queries across downstream tasks, underscoring the need for better negation processing in VLMs.

arXiv AI
Sep 2

Visual Attention Faithfulness in Vision-Language Models is Heterogeneous

The study investigates whether attention weights in Vision‑Language Models (VLMs) accurately reflect model reasoning for visual inputs. Using causal perturbation analysis, it identifies three distinct processing modes—Faithful‑Sufficient, Faithful‑Distributed, and Non‑Focal—indicating heterogeneous visual attention faithfulness. The research also shows that human‑annotated ground‑truth regions align with model attention in only about 60% of cases, highlighting a systematic divergence between model visual reliance and human intuition across VQA, document, and chart tasks.

By Xurui Song, Weishi Wang, Zhongqi Yue, Kuluhan Binici, Tao Bai, Hongxin Shao, Daniel Dahlmeier, Jun Luo
arXiv Computer Vision
3d ago

Perception or Reasoning? Diagnosing and Tackling Reinforcement Learning Bottlenecks in VLMs

The paper introduces Perception and Reasoning Attribution (PARA), a method that quantifies how much of a vision‑language model’s errors can be fixed by better perception versus stronger reasoning. PARA reveals that reinforcement learning (RL) benefits more from improving reasoning than perception, and motivates a new group‑relative attention distillation objective called GRAD. GRAD directly guides weaker rollouts toward the visual attention patterns of the best rollouts, consistently boosting performance across multiple model scales and benchmarks.

By Zeyuan Yang, Zhuohao Chen, Jiaben Chen, Yao Zhang, Maohao Shen, Chuang Gan
arXiv AI
Sep 30

Similar Choices, Different Attention: Cross-Modal Associations in Humans and Vision-Language Models

The study compares human and vision‑language model (VLM) responses to cross‑modal association tasks, using identical stimuli (a pseudo‑word and two images) and recording both choices and eye movements. While larger VLMs show some alignment with human choices, their attention patterns correlate poorly with human gaze, performing no better than a simple center‑bias baseline. Fine‑tuning VLMs on human choices improves choice alignment but not attention alignment, and training on human gaze improves attention correlation without affecting choice accuracy.

By Sumin Hong, Katsumi Ibaraki, Renee Shi, David Chiang, Toby Jia-Jun Li
arXiv AI
Sep 18

Cross-Modal Attention Acts as a Frequency Filter: Why Verbose Prompts Improve Robustness in Vision-Language Models

The paper shows that the wording of prompts in vision‑language models (VLMs) can either improve or worsen robustness to image corruption. Verbose prompts broaden the cross‑modal attention’s frequency filter, making the model less sensitive to corruptions, while semantically complex prompts narrow the filter and increase vulnerability. Experiments on Qwen3‑VL and LLaVA‑OneVision confirm that adding padding or verbose phrasing reduces answer drift by 70–81% on 8B models.

By Farooq Ahmad Wani, Maria Sofia Bucarelli, Mujtaba Hussain Mirza, Oleksandr Pryymak, Aryo Pradipta Gema, Iacopo Masi, Pasquale Minervini, Fabrizio Silvestri
arXiv AI
4d ago

Revealing the Gap in Human and VLM Scene Description through Counterfactual Semantic Saliency

The paper introduces Counterfactual Semantic Saliency (CSS), a black-box, model-agnostic method that measures how the removal of objects from a scene shifts the semantic description produced by vision‑language models (VLMs). Using CSS, the authors compare prominent VLMs to a large human psychophysics baseline (16,603 responses across 307 scenes) and find that VLMs over‑rely on large, centrally located, and highly salient objects, while under‑rely on people compared to humans. The study highlights a significant scene‑comprehension gap between VLMs and human perception, with size bias emerging as a key factor driving model‑human divergence.

By Ziqi Wen, Parsa Madinei, Miguel P. Eckstein
arXiv Computation and Language
Oct 9

SAGE: Sink-Aware Guided Emphasis for Visual Grounding in Vision-Language Decoders

The paper introduces SAGE, a lightweight method that guides decoder attention in vision-language models away from prompt‑invariant attention sinks (PIS) toward query‑dependent regions of interest (ROIs). By using token‑aligned ROI masks from vision backbones like CLIP, ViT, and DINOv3, SAGE improves visual grounding and reduces hallucinations across various VLM families. Experiments show consistent gains on public vision‑language benchmarks, especially in fine‑grained visual discrimination tasks where localized evidence is essential.

By Jeonghyo Song, YoungJoon Yoo
arXiv Computer Vision
Sep 23

Reading Right, Answering Wrong: How Visual Configuration Changes Affect Evidence Use in VLMs

Vision‑language models (VLMs) can lose accuracy when images are resized, even with minimal changes. The study shows that such small visual configuration changes—like tiling or token arrangement—cause more correctness flips across multiple checkpoints and benchmarks. Interestingly, in many cases the models still read the correct answer but fail to use it, and attention interventions reveal that configuration shifts weaken the use of readable information. By guiding models with field cues and their own transcriptions, the authors correct 97.2% of these errors.

By Dingyang Lin, Yingfeng Luo, Chenglong Wang, Chenwei Zhu, Anxiang Ma, Jingbo Zhu, Tong Xiao