Video LMMs name objects and actions reliably but fail to detect the precise frames and locations of contact and release events, revealing shortcut learning instead of physical grounding.
Specifically, the hand is pointing at or touching the container
1 Pith paper cite this work. Polarity classification is still indexing.
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Action Without Interaction: Probing the Physical Foundations of Video LMMs via Contact-Release Detection
Video LMMs name objects and actions reliably but fail to detect the precise frames and locations of contact and release events, revealing shortcut learning instead of physical grounding.