## Problem 101 — rank:75

**Title:** The neural code

**Added binding assumptions (LaTeX):**

```latex
Define the stimulus distribution within each held-out state and the output decoder's allowed information. Decoding $S$ from activity tests accessible stimulus information, not by itself the brain's actual readout. The perturbation must target a prespecified activity feature and its predicted choice law, with sensory, arousal and motor controls. Require the state-only baseline improvement on independent trials.
```

**Direct edits:** 0. **Fresh external checks:** None; supplied sources retained as provenance.