# M1B Predeclared Regime Sweep

**Status:** current local result, generated by `npm run --silent sweep` on the accepted source.

## Protocol

The sweep fixes the 72 by 48 periodic grid, relaxation step `0.15`, excitation strength `1.2`, Gaussian scales `1.7` and `4.3`, response slope `10`, and dimensionless horizon `24`. It varies inhibition strength and threshold over a 3 by 3 grid, repeated for seeds `3`, `17`, and `31`.

The labels were specified in the executable script before the complete result table was inspected. They describe only numerical behavior of this code:

- **low activity:** mean at most `0.15` and spatial standard deviation at most `0.05`;
- **broad activation:** mean at least `0.85` and spatial standard deviation at most `0.05`;
- **persistent spatial structure:** standard deviation at least `0.12`, mean last-step change at most `0.0025`, and seed mean deviation at most `0.02`;
- **unsettled or seed-sensitive:** every other case.

## Current result table

| Inhibition strength | Threshold | Classification | Mean | Spatial SD | Last-step change |
| --- | --- | --- | ---: | ---: | ---: |
| 0.8 | 0.05 | broad activation | 0.967 | 0.000 | 0.0000 |
| 0.8 | 0.10 | broad activation | 0.941 | 0.000 | 0.0000 |
| 0.8 | 0.15 | persistent spatial structure | 0.793 | 0.264 | 0.0004 |
| 1.0 | 0.05 | persistent spatial structure | 0.588 | 0.387 | 0.0005 |
| 1.0 | 0.10 | persistent spatial structure | 0.498 | 0.401 | 0.0006 |
| 1.0 | 0.15 | persistent spatial structure | 0.414 | 0.388 | 0.0007 |
| 1.2 | 0.05 | persistent spatial structure | 0.439 | 0.390 | 0.0004 |
| 1.2 | 0.10 | persistent spatial structure | 0.373 | 0.370 | 0.0005 |
| 1.2 | 0.15 | persistent spatial structure | 0.220 | 0.198 | 0.0017 |

## Interpretation boundary

This small grid establishes a useful internal finding: under the declared synthetic rule, weaker inhibition and low threshold settle to nearly uniform high activity, while the other tested settings meet the project’s predeclared numerical criterion for persistent spatial structure. It does **not** establish biological regimes, biological mechanisms, or a general phase diagram.

The next credible step is to add topology and boundary-condition comparisons, then make a single article around the transparent question: how much of a visible field pattern survives explicit numerical choices?