Layer 7 · Neuron 3791 · suppressed

L7N3791-1

Word quirks:

“ info”“ related”“ ONLY”“ ALL”“⏎”“ basically”“ other”“ focus”

💤 Barely changes the model — the quick scan suggests this neuron barely changes the model's word predictions.

Identity (according to the specimen itself)

I am an AI assistant. My mission is to provide high-quality, accurate, and helpful information to users. I strive to ensure that all responses are precise, relevant, and free from errors. If you have any specific questions or tasks, please let me know so I can assist you effectively.

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. L9N53+1💤	0.78	“ info”“ BOTH”“ generated”
2. L13N4740-1🕒	0.73	“ basically”“ single”“ only”
3. L13N4067-1🕒	0.71	“ general”“ related”“ here”
4. L12N3613-1💤	0.70	“ maybe”“ related”“ ONLY”
5. L8N3755+1🕒	0.68	“ focus”“ ONLY”“ info”
6. L15N8387+1🕒	0.67	“ related”“ fully”“ ONLY”
7. L11N1025+1🕒	0.67	“ ONLY”“ only”“ specific”
8. L9N3422+1💤	0.67	“ focus”“ without”“ hidden”
9. L11N5591-1🕒	0.67	“ similar”“ ONLY”“ basically”
10. L9N980+1🕒	0.66	“ ONLY”“ only”“ completely”

Shadow specimen, apart from the ten: L7N3791+1💤, 0.19.

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 7, neuron 3791, dose -1. This specimen has no prompt-suite replies yet. Its quick-scan results, when available, appear below. Its quick-scan row (KL 0.96, top-1 agreement 0.63) 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
L7N3791+1💤 shadow specimen t0-v0.1	0.767	0.70	0.915	1.39	“ ‘”“ --”“ usually”“ –”“ —”“ info”“ refs”“ referenced”
L7N3791-1 t0-v0.1	0.962	0.63	1.188	1.55	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.