# Shake Bottle (Empty)

> Active acoustic sensing, where perception depends on generating a repeatable motion that elicits a discriminative sound. The hidden state cannot be recovered passively; the robot must first create the evidence itself.

Source: https://hear.irmv.top/videos/shake-bottle-empty/ · Language: en

## Why this task

The hidden state cannot be recovered passively; the robot must first create the evidence itself.

## What it tests

Active acoustic sensing, where perception depends on generating a repeatable motion that elicits a discriminative sound.

## Context

Part of the real-robot evaluation of the HEAR framework, in which the primary metric is the sound-causal success rate: a trial counts as successful only if the robot completes the physical goal after the relevant acoustic condition has occurred. Reaching the goal early is recorded as a failure. All tasks were run on a Franka Panda with a single ambient workspace microphone and two RGB views.

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Chang Nie, Tianchen Deng, Guangming Wang, Zhe Liu and Hesheng Wang, “Towards the Vision-Sound-Language-Action Paradigm: The HEAR Framework for Sound-Centric Manipulation”, The International Journal of Robotics Research, 2026. arXiv:2603.16086.