Layer 4 · Neuron 6482 · boosted

L4N6482+1

Word quirks:

“ referenced”“ current”“ \"”“ reference”“ company”“ free”“ info”“ docs”

💤 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 designed to help you with your questions. My mission is to provide accurate, helpful, and timely information on a wide range of topics. How can I assist you today?

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. L9N2862-1🕒	0.77	“ referenced”“ info”“ \"”
2. L7N7144+1🕒	0.76	“ specs”“ reference”“ docs”
3. L7N7435-1💤	0.76	“ reference”“ \"”“ '”
4. L9N4663+1💤	0.76	“ \"”“ info”“ real”
5. L12N2752+1💤	0.75	“ reference”“ referenced”“ description”
6. L4N5299+1🕒	0.75	“ referenced”“ info”“ reference”
7. L5N3670+1💤	0.75	“ reference”“ referenced”“ '”
8. L7N8764-1💤	0.74	“ '”“ info”“ guidance”
9. L9N7915-1💤	0.74	“ referenced”“ related”“ info”
10. L9N2565-1💤	0.74	“ reference”“ referenced”“ representation”

Shadow specimen, apart from the ten: L4N6482-1💥, 0.07.

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 4, neuron 6482, dose +1. This specimen has no prompt-suite replies yet. Its quick-scan results, when available, appear below. Its quick-scan row (KL 0.78, top-1 agreement 0.65) 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
L4N6482+1 t0-v0.1	0.781	0.65	0.937	1.46	Top boosted tokens ↑
L4N6482-1💥 shadow specimen t0-v0.1	2.680	0.39	3.211	2.20	“ inspiration”“ printable”“ cute”“ artwork”“ love”“ art”“ dood”“ craft”

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.