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Preprint . 2026
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Preprint . 2026
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Three Phases of Internal Processing in Transformer LLMs: Semantic Emergence, Layer Inflection Points, and Training Corpus Signatures

Authors: Campos Vargas, Rodrigo;

Three Phases of Internal Processing in Transformer LLMs: Semantic Emergence, Layer Inflection Points, and Training Corpus Signatures

Abstract

We identify three universal phases of internal processing in transformer language models through systematic analysis of Qwen2.5-7B-Instruct: a Chaos Phase (L0-L8) dominated by training corpus tokens, an Organization Phase (L9-L23), and a Crystallization Phase where the correct token abruptly emerges. We distinguish false emergence (generic placeholders in hard queries) from real emergence, and show that emergence layer correlates negatively with final token probability.

Keywords

mechanistic interpretability, representation, transformer, layer analysis, LLM internals, semantic emergence

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green