> ## 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.

# Positive Valence Systems

> reward_responsiveness · reward_anticipation · reward_satiation

| Construct               | Description                                       |
| :---------------------- | :------------------------------------------------ |
| `reward_responsiveness` | Hedonic engagement with rewarding stimuli         |
| `reward_anticipation`   | Motivation toward expected reward                 |
| `reward_satiation`      | Decline in reward responsiveness with consumption |

Key contributors: `prosodic_flatness`, `f0_range`, `intensity_mean`, facial affect (happiness, engagement), assessment context (PHQ-9 item 1 anhedonia).