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PH017 — Pleasure & Interest Capacity

Capacity to experience interest, anticipatory pleasure, and consummatory engagement with rewarding or meaningful activities — the functional domain overlapping anhedonia in depressive and related conditions.

How readily interest and pleasure in activities can be felt and sustained — distinct from raw motivation to start tasks or reward-seeking behaviour.

Therapeutic areas: TA001 ★TA002TA003TA007

Provenance: Introduced in registry v3 (2026) following cross-TA depression gap analysis. Benchmarked against RDoC Positive Valence Systems (reward valuation, consummatory pleasure / anhedonia) to remain distinct from Reward Regulation (PH009), Motivation/Drive (PH002), and Behavioural Activation (PH010). (origin: BRAIN)

Related phenomes: PH002 — Motivation / Drive, PH009 — Reward Regulation, PH010 — Behavioural Activation

External framework cross-references

RDoC domains

  • Positive Valence Systems — reward valuation
  • Positive Valence Systems — initial response to reward / consummatory pleasure

DSM / ICD context

  • Major depressive disorder — anhedonia
  • Bipolar disorder — reduced pleasure capacity

Foundational Evidence

Evidence Confidence: Low–Medium

Registry-level score for this phenome's foundational evidence stack — not Biology → Phenome Confidence on individual mechanism pages.

Construct and biology→phenome layers are review- and mechanistic-heavy; Jackson (2021) adds human intervention support for mood/pleasure domains without isolating anhedonia as a primary endpoint.

Registry-level foundational evidence for this phenome. Mechanism pages link to phenome IDs and carry relationship-specific evidence — not duplicated here.

Construct landmark papers

  • Gruber et al. (2023) — Reviews insulin–dopamine reward-processing disruption in depression pathophysiology.
  • Lopresti & Drummond (2014) — Systematic review of saffron clinical studies and antidepressant mechanisms — pleasure/mood construct validation.

Biology → phenome landmark papers

  • Gruber et al. (2023) — Brain dopamine signalling and reward processing as underexplored depression mechanisms.
  • Song et al. (2023) — Mitochondrial dysfunction in depression — adjacent biology for reward-energy integration.

Nutrition → biology landmark papers

  • Jackson et al. (2021) — Saffron RCT reported reduced depression scores and improved social well-being in subclinical mood contexts.
  • Ferguson et al. (2014) — Omega-3 PUFA modulates inflammatory and resolution-phase biology intersecting mood pathways.

Connected mechanisms

BRS1

BRS3