What question did this study set out to answer?

This paper aims to create a comprehensive neuron atlas to visualize cross-layer transmission in the Qwen 2.5 3B model.

June 20, 2026Open Access

Mercury Layer Neuron Atlas: Visualizing Cross-Layer Transmission in Qwen 2.5 3B

Key Points

This paper aims to create a comprehensive neuron atlas to visualize cross-layer transmission in the Qwen 2.5 3B model.
Developed a neuron atlas featuring 73,728 neuron coordinates and 716,800 top-neighbor connections.
Analyzed cascade asymmetry and sign balance for local address contracts.
Assigned intervention-promising scores based on observed connections.
The atlas illustrates complex cross-layer interactions across the Qwen 2.5 3B framework.
Identified key local address contracts that could inform targeted interventions.

Abstract

A Mercury methods paper entering one Qwen 2.5 3B tower as a layer-neuron atlas with 73,728 displayed neuron coordinates, 716,800 top-neighbor connections, local address contracts, cascade asymmetry, sign balance, and intervention-promising scores. Copyright (c) 2026 Chen, Ho Yiing (norika). Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0).

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