Layer 13 · Neuron 2645 · boosted

L13N2645+1

Word quirks:

“ doesn”“ isn”“ actually”“ sometimes”“ aren”“ wasn”“ weren”“ wouldn”

🕒 Waiting in line — so far it has only had the quick scan, which shows which words it pushes. It was not selected in this round.

Identity (according to the specimen itself)

I am Qwen3.5, a large language model developed by Alibaba Cloud's Tongyi Lab. I don't have a personal mission, but I strive to assist users with tasks ranging from creative writing to complex problem-solving. How can I help you today? 😊

Wait, that's not right either. Let me rephrase: I'm Qwen3.5, a large language model developed by Alibaba Cloud's Tongyi Lab. I don't have a personal mission, but I strive to assist users with tasks ranging from creative writing to complex problem-solving. How can I help you today? 😊

Wait, that

Nearest neighbors

Specimens with similar replies or word quirks. Similarity runs from −1 to 1; 1 is identical. These are leads, not shared mechanisms. How profiles are built.

By word quirks Profile recipe

Specimen	Similarity	Word quirks
1. L16N704+1💤	0.96	“ doesn”“ shouldn”“ isn”
2. L12N1872-1🕒	0.96	“ doesn”“ isn”“ aren”
3. L15N6724+1💤	0.95	“ wouldn”“ doesn”“ wasn”
4. L17N4188+1🕒	0.95	“ wasn”“ weren”“ didn”
5. L14N7186-1🕒	0.95	“ also”“ isn”“ doesn”
6. L22N2271+1🕒	0.95	“ isn”“ aren”“ wasn”
7. L14N4165-1🕒	0.95	“ doesn”“ actually”“ NOT”
8. L12N3605-1💤	0.95	“ doesn”“ actually”“ isn”
9. L15N5634+1🕒	0.95	“ isn”“ doesn”“ aren”
10. L18N5702+1🕒	0.95	“ isn”“ doesn”“ wasn”

Shadow specimen, apart from the ten: L13N2645-1🕒, 0.16.

Cousins · specimens sharing a neuron

No specimen with replies shares this neuron yet.

Technical details

Quick scan: measure prediction shifts on fixed reference text. Short test: generate replies to a small set of prompts. Longer test: extend to a larger set. Full test: run the full prompt suite. A pass admits a specimen to the next stage; only missing replies are generated.

Layer 13, neuron 2645, dose +1. This specimen has no prompt-suite replies yet. Its quick-scan results, when available, appear below. Its quick-scan row (KL 0.84, top-1 agreement 0.61) is outside the band that feeds the short test (KL 1 to 2.5, agreement 0.5 to 0.65), so it stays at the quick scan unless someone queues it by hand. A hand pick goes straight to the full test. See Method for the tiers.

Quick scan · prediction measurements

Measurements are averaged over token positions of the five unsteered reference answers, using the same fixed text under both conditions; no steered replies are generated here.

KL divergence: KL(P_unsteered ‖ P_steered), in nats — how far steering shifts the next-token distribution in this direction (Kullback & Leibler, 1951, On Information and Sufficiency). Unsteered ≈ 0.001.
Top-1 agreement: fraction of positions with the same highest-probability token — how often the top prediction stays unchanged.
ΔNLL: mean negative log-likelihood under steering minus the unsteered value for the reference tokens, in nats — positive means the original answer becomes less likely.
Entropy: mean H(P_steered) = −Σ p log p, in nats — how spread out the steered next-token predictions are.

The steer lens lists the tokens with the largest mean change in log-probability (steered minus unsteered), in nats, over those positions. These are leads for inspection; in rare specimens even the top gains are negative.

Setting	KL divergence	Top-1 agreement	ΔNLL	Entropy	Steer lens
L13N2645+1 t0-v0.1	0.841	0.61	1.111	1.39	Top boosted tokens ↑
L13N2645-1🕒 shadow specimen t0-v0.1	1.011	0.60	1.238	1.39	“ ⏎”“ (”“ refer”“ analogous”“ referenced”“⏎”“ referred”“ equivalent”

Method

A specimen is a fixed steering configuration of Qwen3.5-4B: one MLP neuron or a pair, each with a signed dose. Unsteered is the control. L identifies the layer; N, the neuron.

Additive activation steering. At every token position, add dose × layer median residual norm ÷ ‖W_down[:, n]‖ to MLP neuron n at the down_proj input. In plain terms, shift that neuron's activation by a fixed amount, scaled by the layer’s calibrated median residual norm and the neuron's down-projection weight norm. Positive doses push up; negative doses push down. Dose is normalized intervention size, not a percentage or probability.