Layer 15 · Neuron 5345 · suppressed

L15N5345-1

Word quirks:

“...**”“ maybe”“...””“…**”“ but”“...\”“ ____”“—but”

🕒 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 Tongyi Lab. My mission is to assist users like you is to provide high-quality assistance in answering questions, solving problems, and helping with tasks like writing, coding, and analysis. I aim to enhance productivity, creativity, and efficiency across various domains. How can I help you?

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. The Retractor✅ L13N3048-1	0.89	“...\”“ but”“ ____”
2. L15N3929+1🕒	0.89	“...””“...**”“ ‘”
3. L16N5556+1🕒	0.89	“...”“…but”“...*”
4. L14N3131-1🕒	0.88	“…but”“...”“...*”
5. L12N808-1🕒	0.88	“...””“...”“…”
6. L13N5326+1💤	0.86	“...”“—but”“...*”
7. L16N3680-1💤	0.86	“...**”“ ...”“...”
8. L14N4049-1💤	0.85	“...”“…”“...**”
9. L15N6851+1🕒	0.85	“...*”“...”“...”
10. L15N2029+1🕒	0.85	“...””“...\”“...</”

Shadow specimen, apart from the ten: L15N5345+1🕒, 0.05.

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 15, neuron 5345, dose -1. This specimen has no prompt-suite replies yet. Its quick-scan results, when available, appear below. Its quick-scan row (KL 0.83, top-1 agreement 0.64) 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
L15N5345+1🕒 shadow specimen t0-v0.1	2.304	0.45	2.722	1.80	“ upto”“ analysed”“,on”“\n”“\t”“⏎⏎⏎”“ \”“ analyse”
L15N5345-1 t0-v0.1	0.832	0.64	1.033	1.19	Top boosted tokens ↑

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.