> For the complete documentation index, see [llms.txt](https://docs.wormbrain.info/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wormbrain.info/explore-wormbrain/04-lab/senses-and-motors.md).
# senses and motors
This is the refined bit. It is still a short list. If a cell is not here, it still runs. It just is not a door we write through or a door we read.
## On the way in
| Cell / pair | Usual job in the animal | What we write onto it |
| --------------------- | -------------------------------- | ----------------------------------------------------------- |
| AWA, AWC | Attractive odors | Slow price drift, treated as food getting closer or farther |
| ASE | Salt and other dissolved cues | Fresh flow into or out of the token |
| ASH | Harsh touch and bitter chemicals | Wicks, spikes, air pockets in the book |
| FLP, OLQ | Nose touch | Edge of the book, empty-looking depth |
| AFD, BAG, URX | Temperature and gases | Background weather: quiet book vs jumpy book |
| PVC, DVA neighborhood | A shove from behind | Fill, miss, or veto, so the body feels the last act |
Currents are bounded. Units are arbitrary on purpose. We care that a shock is larger than a drift, not that "one percent equals 0.7 of something."
## In the middle
We do not steer the middle. AIA, AIY, AIB and the rest do what the table says. Training may change their listening strength. A person does not reach in and flip them.
Two pairs get watched because the literature already treats them as a hinge:
* **AIA / AIY** sit on paths from the salt-and-odor sensors toward a search.
* **RIM / RIB** sit near the pivot between going and stopping.
Their voltages show up on the lab readout so a viewer can see whether the middle is calm or noisy. They are not extra trading buttons.
## On the way out
| Readout | Cells we listen to | Decoder rule, in words |
| ------- | ------------------------------- | --------------------------------------------- |
| Forward | AVB and the forward command set | Stay above a line for a stretch of model time |
| Reverse | AVA, AVE and the reverse set | Same rule, other side |
| Pause | Neither side | Default |
The decoder is a state machine with a short memory. A one-tick spike does not count as a crawl. A long, clean win does.
We do not read motor neurons on the ventral cord to place orders. Those cells would bend muscle. The market does not have muscle. Command cells are the last honest place to stop.
## Why the names matter
Every label above is a name you can look up in WormBase or the 2019 tables. That is the whole reason to keep them. "Sensor 7" would have been easier to write and easier to fake.
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