> ## Documentation Index
> Fetch the complete documentation index at: https://docs.medera.info/llms.txt
> Use this file to discover all available pages before exploring further.

# Affect & Emotion

> Per-frame affect classification and engagement

The facial pipeline includes optional per-frame affect classification across 6 basic emotions + neutral plus engagement scoring. These features are computed by the analyzer (not the engine itself) and are available in the canonical multimodal payload. | Output | Range |
\| :--- | :--- |
\| Emotion classes | anger / disgust / fear / happiness / sadness / surprise / neutral |
\| Engagement | 0–1 | Affect outputs contribute to neurobehavioral constructs in the Negative Valence and Positive Valence domains via.