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← Phenome Registry

PH016 — Apprehensive Worry / Perseverative Thought

Capacity to limit sustained apprehensive worry, rumination, and difficulty disengaging from threat-anticipatory or negative perseverative thought.

How much worry, rumination, or hard-to-stop apprehensive thinking intrudes on everyday function — distinct from general emotional reactivity or stress-response intensity.

Therapeutic areas: TA001 ★TA002TA003TA006

Provenance: Introduced in registry v3 (2026) following cross-TA anxiety/depression gap analysis. Benchmarked against RDoC Negative Valence Systems (potential threat) and Cognitive Systems (perseverative thought / cognitive control) to remain distinct from Emotional Regulation (PH003) and Stress Reactivity (PH015). (origin: BRAIN)

Related phenomes: PH003 — Emotional Regulation, PH011 — Cognitive Clarity, PH015 — Stress Reactivity

External framework cross-references

RDoC domains

  • Negative Valence Systems — potential threat (anxiety)
  • Cognitive Systems — cognitive control / perseverative thought

DSM / ICD context

  • Generalised anxiety disorder
  • Major depressive disorder — rumination / worry features

Foundational Evidence

Registry-level Phenome Evidence Confidence (below) is independent of Biology → Phenome Confidence and Evidence Confidence on individual mechanism pages. Use the scoring guide for definitions of all three scores.

These are three independent scores. They are not combined or averaged. A phenome can have Medium registry evidence while individual mechanism rows show different Biology → Phenome and Evidence scores.

1. Phenome Evidence Confidence (Phenome Registry only)

Question: How convincing is the foundational evidence that this phenome is a valid, well-defined functional construct — and that diet-relevant biology can plausibly connect to it?

Not a roll-up of Biology → Phenome Confidence or Evidence Confidence from Primary Mechanism page rows. Those are scored per mechanism; this score is assigned once per phenome at registry level.

Derived from foundational landmark evidence organised in up to three layers: construct validation, biology→phenome linkage, and nutrition→biology modulation. Each layer may include one or many landmark papers depending on registry review.

2. Biology → Phenome Confidence (Primary Mechanism page §3 rows)

Question: If this PM/FM biology were substantially impaired in isolation, how directly would that phenome be expected to suffer — within BRAIN architecture?

How it is derived: Reviewers read the PM/FM definition and biological function first — initially ignoring attached references and whether dietary intervention studies exist. References are reviewed only when scoring Evidence Confidence (below).

Score levels (the value shown on each row as Biology → Phenome Confidence):

  • High — primary biological determinant (e.g. noradrenergic signalling → attention; GABA synthesis → calming tone)
  • Medium — major contributory determinant, not the sole driver
  • Low–Medium — established but indirect, modulatory, or one integrative step removed
  • Low — distal, conditional, or weak biological coupling

“Not dietary treatment efficacy” means this score does not ask whether a diet or supplement treats the phenome. It asks whether the biology itself is architecturally relevant. Limited dietary RCT evidence belongs in Evidence Confidence, not here.

3. Evidence Confidence (Primary Mechanism page §3 rows)

Question: How convincing are the attached Key References on that specific row that this biology actually relates to this phenome?

How it is derived: Assigned after Biology → Phenome Confidence, by reviewing only the references on that PM/FM row. Judges whether refs support the relationship — not just mechanism or phenome in isolation.

  • High — strong convergent human evidence directly linking mechanism biology to phenome variation
  • Medium — multiple human lines supporting the relationship; may include one bridge study with an inferential step
  • Low–Medium — convergent translational stack without direct mechanism↔phenome measurement on the row
  • Low — mechanistic or preclinical only; mechanism and phenome supported separately but not bridged

Often equal to or lower than Biology → Phenome Confidence. Can occasionally be higher when outcome evidence is stronger than the mechanism's contributory role.

Phenome Evidence Confidence: Medium

Foundational stack combines neuroimmune framing for inflammatory–perseverative cognition (Slavich & Irwin, Marsland) with convergent human mechanistic and intervention evidence (Kiecolt-Glaser, Ferguson). Attached anxiety outcomes require one inferential step to PH016 — not direct dietary treatment efficacy for worry disorders.

Construct landmark papers

  • Briguglio et al. (2018) — Reviews dietary neurotransmitter biology (including serotonin) relevant to neuropsychiatric anxiety and mood contexts.
  • Marsland et al. (2017) — Links systemic inflammation to default-mode network connectivity patterns associated with perseverative thought.

Biology → phenome landmark papers

  • Slavich & Irwin (2014) — Neuroimmune model linking stress, inflammatory signalling, and affective/perseverative cognition biology.
  • Marsland et al. (2017) — Neuroimmune signalling intersects default-mode hyperconnectivity relevant to worry/rumination biology.
  • Batey et al. (2024) — LPS-linked neurotransmission disruption in depression — adjacent biology for inflammatory–affective perseveration context.

Nutrition → biology landmark papers

  • Kiecolt-Glaser et al. (2011) — Omega-3 supplementation lowered anxiety and inflammatory markers in stressed adults.
  • Zelicha et al. (2022) — Polyphenol-rich dietary pattern reduced inflammatory tone — upstream context for neuroimmune worry biology.

Connected mechanisms

BRS1

BRS3