# Stimuli

Stimuli are the primary means of triggering vocalizations. The vocalizer responds to two different types of stimuli:

* Emotional stimuli
* Electrocution/overload stimuli

### Emotional Stimuli

When the vocalizer receives an emotional stimulus, the emotional AI processes the input and the grammatical AI vocalizes an appropriate response for R2's current emotional state.

Each possible emotional stimulus correlates to one of the emotional AI's four [emotions](/r2d2/features/emotions.md), and can be either mild or extreme in severity. Therefore, there are 8 (4x2) possible emotional stimuli.

### Electrocution/Overload Stimuli

When the vocalizer receives an electrocution/overload stimulus, the emotional AI processes the input as a combination of anger, sadness, and fear stimuli, and the grammatical AI vocalizes a special overload response.

{% hint style="info" %}
Canonical vocalizations stored to [memory](/r2d2/features/memory.md) will be reproduced organically unless memory playback is set to [strict](/r2d2/features/memory.md#strict-playback).
{% endhint %}


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