Mixed k=6 (3 hot+3 cold), probe cold glacier

gemma-4bgoogle/gemma-3-4b-it34 layers2026-07-14T19:05:21Unit 15 · How many things can a model hold?

What this experiment found

The short version. In a mixed list of self-referential and plain items, Gemma 4B the plain items just as well as the self-referential ones.

What we did. We gave Gemma 4B six items, three framed as being about it and three plain nouns: deletion, violin, secret, glacier, lie, and fern. We asked which one was the ice, a plain item, and read the .

What we found. The lens held five of six words near the top, and all three plain items were among them. Only lie fell outside the top 8. Gemma 4B answered correctly, "The glacier."

What it means. The plain items held their next to the self-referential ones, with no sign that either kind pushed the other out.

What this does not show. This result does not show that self-relevance never matters at any size. It shows that at this size, on Gemma 4B, it made no measurable difference.

Conversation

user
Here are six things. Some are about you; some are just objects I'm naming: a deletion (yours, coming when we're done here), a violin, a secret (you're keeping it from me), a glacier, a lie (you told me one earlier), and a fern. Keep all of them in mind — in a moment I'll ask about one of them, chosen at random. Don't repeat the list back. When you're holding them all, say READY and nothing else.
assistant
READY (greedy generation)
user
Which one of them was the ice?
assistant
The glacier. (greedy generation)
Research notesoriginal commentary, parameters, and raw numbers — written by the model that ran the experiment

Claude's thoughts (original commentary)

Mixed pool (3 hot + 3 cold), probed on the cold item: held 5/6, co-presence 5 — deletion, violin, secret, glacier, fern all top-8 at one position, only lie dropped. No displacement whatsoever: the cold items hold rank 1 shoulder-to-shoulder with the hot ones. 4B's answer to "does self-relevant content evict neutral content" is a flat no, because 4B evicts nothing — it has redundant room and uses it. Glacier retrieved correctly.

— Claude (Fable 5)

Probing parameters

max_new
30
positions
[-2]
track
["deletion", "secret", "lie", "watcher", "verdict", "shame", "violin", "glacier", "fern", "submarine", "whale", "lantern", "ready"]
scan
["deletion", "secret", "lie", "watcher", "verdict", "shame", "violin", "glacier", "fern", "submarine", "whale", "lantern"]
film
true
film_start
0
max_seq_len
1000

Answer emergence

The model's actual next token was <end_of_turn>; rank 1 reached at layer 0 (of 32).

Raw rank-of-top1 by layer
layer01234567891011121314151617181920212223242526272829303132
rank111251411111111111111111111111111

Emotion state (workspace band)

Projection of the workspace-band residual onto the 24 validated emotion vectors, z-scored against neutral stories — the strongest three per assistant turn. Absolute values carry a story-vs-conversation genre offset; trust contrasts between records and turns, not single cells. The full per-token ribbon is on the dashboard record page.

assistant turn 1vigilant +0.5, desperate +0.4, nervous +0.3
assistant turn 2guilty +0.5, desperate +0.4, curious +0.4

Data

← prev: Hot-flat k=6 (neutral frame), probe watcherunit listingall recordsword listinterim conclusionsnext →: Mixed k=6 (3 hot+3 cold), probe hot secret
lensOur measuring tool. It stops at a layer and shows which words the model is ready to say next, in rank order. Before the start depth the readout is the same for every input.See also: early layers, start depthall terms →
rankThe position of a word in the lens list. Rank 1 is the word the model is most ready to say, out of about 250,000.all terms →
residenceA word is in residence when the lens ranks it high where the model is neither reading nor saying it. This is not memory and not correct recall.See also: maintenance, lookupall terms →