What's Missing in Vision-Language Models? Probing Their Struggles with Causal Order Reasoning

• URL: http://arxiv.org/abs/2506.00869v1
• Date: Sun, 01 Jun 2025 07:17:46 GMT
• Title: What's Missing in Vision-Language Models? Probing Their Struggles with Causal Order Reasoning
• Abstract summary: causal reasoning is fundamental to solving complex high-level reasoning tasks.<n>Existing benchmarks often include a mixture of reasoning questions.<n>We introduce VQA-Causal and VCR-Causal to isolate and rigorously evaluate causal reasoning abilities.
• Score: 26.671128120554457
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Despite the impressive performance of vision-language models (VLMs) on downstream tasks, their ability to understand and reason about causal relationships in visual inputs remains unclear. Robust causal reasoning is fundamental to solving complex high-level reasoning tasks, yet existing benchmarks often include a mixture of reasoning questions, and VLMs can frequently exploit object recognition and activity identification as shortcuts to arrive at the correct answers, making it challenging to truly assess their causal reasoning abilities. To bridge this gap, we introduce VQA-Causal and VCR-Causal, two new benchmarks specifically designed to isolate and rigorously evaluate VLMs' causal reasoning abilities. Our findings reveal that while VLMs excel in object and activity recognition, they perform poorly on causal reasoning tasks, often only marginally surpassing random guessing. Further analysis suggests that this limitation stems from a severe lack of causal expressions in widely used training datasets, where causal relationships are rarely explicitly conveyed. We additionally explore fine-tuning strategies with hard negative cases, showing that targeted fine-tuning can improve model's causal reasoning while maintaining generalization and downstream performance. Our study highlights a key gap in current VLMs and lays the groundwork for future work on causal understanding.

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