> For the complete documentation index, see [llms.txt](https://docs.axobug.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.axobug.com/stimuli.md).

# Stimuli

Taste, scent, light, touch and more. Choose the input; see where the signal goes.

## Choose a stimulus

Pass the exact ID in the stimulus field. Each preset stimulates an annotated sensory population in the model; these are preset signals, not raw camera, microphone or temperature-sensor inputs.

| ID        | Sense       | What it stimulates                                                                          |
| --------- | ----------- | ------------------------------------------------------------------------------------------- |
| sugar     | TASTE       | Give your fly something sweet. Follow the signal from taste neurons to the feeding circuit. |
| loom      | VISION      | An approaching shadow. Watch the signal reach the giant-fibre escape circuit.               |
| food      | SMELL       | A hint of fermenting fruit. Explore how an odour spreads through the brain.                 |
| touch     | TOUCH       | Stimulate the tiny bristles on the eye and inspect the downstream response.                 |
| song      | SOUND       | Send a courtship-song signal into the hearing neurons of the antenna.                       |
| pheromone | PHEROMONE   | Send a pheromone signal into the DA1 olfactory pathway.                                     |
| colour    | COLOUR      | Light up the R7 and R8 photoreceptor pathways and follow the response.                      |
| humid     | HUMIDITY    | Stimulate the annotated humidity-sensing neurons.                                           |
| heat      | TEMPERATURE | Send a signal through the thermosensory population.                                         |
| bitter    | BITTER      | Stimulate other labellar taste classes and compare their response with sugar.               |

## A quiet point of comparison

Use stimulus: "none" for the unstimulated control. You can also set intensity: 0 on any preset. Neither adds external stimulation; this model has no spontaneous activity at that baseline.

{% hint style="info" %}
**Same brain, different input**

Switching a preset changes which population receives the stimulus. It does not select a different species or a separately trained model.
{% endhint %}

## Tune your experiment

| Parameter    | Accepted values              | Default |
| ------------ | ---------------------------- | ------- |
| intensity    | Number from 0 to 2           | 1       |
| duration\_ms | 50, 100, 150 or 200          | 100     |
| seed         | Integer from 0 to 4294967295 | 42      |

Duration is simulated time, not the request’s wall-clock latency. With the same model and settings, matching seeds reproduce neural outputs; request IDs and compute times may differ. Change the seed to explore another realization of the same input.


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