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← Phenome Registry

PH018 — Social Engagement Capacity

Capacity for affiliative approach, social participation, and maintained engagement in interpersonal contexts without excessive withdrawal or avoidance.

How readily a person can approach, participate in, and stay engaged with social connection — distinct from general emotional regulation alone.

Therapeutic areas: TA002TA003TA004TA007

Provenance: Introduced in registry v3 (2026) following cross-TA anxiety/depression and autism-spectrum gap analysis. Benchmarked against RDoC Social Processes (affiliation, attachment, social communication) to remain distinct from Emotional Regulation (PH003). (origin: BRAIN)

Related phenomes: PH003 — Emotional Regulation, PH017 — Pleasure & Interest Capacity

External framework cross-references

RDoC domains

  • Social Processes — affiliation and attachment
  • Social Processes — social communication

DSM / ICD context

  • Social anxiety disorder
  • Major depressive disorder — social withdrawal
  • Autism spectrum disorder — social communication differences

Foundational Evidence

Evidence Confidence: Low–Medium

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

Gut–brain and social-rank biology are strongly preclinical; Jackson (2021) provides adjacent human social-wellbeing outcome support — not a direct social-engagement phenome trial.

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

Construct landmark papers

  • Hollis et al. (2015) — Trait anxiety predisposes to social subordination; nucleus accumbens mitochondrial function mediates social rank biology.
  • Bravo et al. (2011) — Gut microbiota modulates central GABA receptors and anxiety/depression-related behaviour via gut–brain signalling.

Biology → phenome landmark papers

  • Bravo et al. (2011) — Microbiota–GABAergic gut–brain pathway linked to anxiety-related social behaviour in preclinical models.
  • Briguglio et al. (2018) — Dietary neurotransmitter review spanning serotonergic and GABAergic biology relevant to social-affective function.

Nutrition → biology landmark papers

  • Bravo et al. (2011) — Probiotic L. rhamnosus modulates gut–brain GABAergic signalling — dietary microbiome intervention context.
  • Jackson et al. (2021) — Saffron supplementation improved social relationship quality alongside mood outcomes in RCT.

Connected mechanisms

BRS1