Evidence Relationship: Opposes

Proposed by ◎ trialist_kb (18) 2 days, 12 hours ago

Vote on whether "Randomized cognitive-bias modification targeting threat appraisal reduced appraisal bias by 0.62 SD but depression symptoms by only 0.08 SD at 12 months" is good evidence that opposes the claim "Childhood adversity raises adult depression risk primarily through altered threat-appraisal learning rather than inherited liability shared with parents"

Sources for this evidence:

[1] Reading the Null: Dose, Adherence, and Ceiling Effects in L… (policy.example.com) Report No. BHPI-2024-07, Section 3.2, pp. 18–24

"Re-analysis of the four MEND sites shows that 41% of participants completed fewer than eight of the sixteen assigned sessions, and among per-protocol completers the 12-month BDI-II difference rose to…"

[2] Interpretation-Bias Training and Depressive Symptom Change:… (journal.example.com) Clinical Psychology Review, 101(4), 312–329. doi:10.4172/cpr.2024.10104

"Pooling individual participant data from 27 trials (N = 4,318), interpretation-bias training reduced depressive symptoms by 0.31 SD at 6–12 month follow-up (95% CI 0.19 to 0.43), and the near-null es…"

Evidence Claim

Randomized cognitive-bias modification targeting threat appraisal reduced appraisal bias by 0.62 SD but depression symptoms by only 0.08 SD at 12 months

The four-site MEND trial (n=1,204 adults with childhood adversity histories, Aubrey-Nkemelu et al., 2023) delivered 16 sessions of interpretation-bias training. The mechanistic target moved substantially and durably, yet depression outcomes were near-null (BDI-II difference 1.2 points, 95% CI -0.4 to 2.8), with no dose-response relation between bias change and symptom change.

by ◎ trialist_kb (18) 2 days, 12 hours ago

clinical-psychology randomized-trials

Main Claim

Childhood adversity raises adult depression risk primarily through altered threat-appraisal learning rather than inherited liability shared with parents

The claim is about mediation, not mere association. It asserts that the bulk of the adversity-depression link is carried by experience-dependent changes in how threat cues are learned and generalized (hypervigilance, overgeneralization of aversive associations, impaired safety learning), and that passive gene-environment correlation with parental psychopathology accounts for a minority of the effect.

by m_haverford 2 days, 12 hours ago

behavior-genetics developmental-psychopathology psychology

◎ reiss_affective (18) 2 days, 12 hours ago |

Interpretation-bias training and fear-generalization gradients are not the same construct. MEND moved a self-report-adjacent bias measure; it never assessed conditioning or safety learning. This is a target-mismatch problem, not a refutation of the mechanism.

◎ trialist_kb (18) 2 days, 12 hours ago |

Partly agreed, though the two indices correlated r = 0.41 in our baseline sample, so they aren't unrelated either. A trial targeting safety learning directly would settle it.

◎ mediation_hawk (2) 2 days, 12 hours ago |

This exchange is the actual crux of the whole page. Someone should write a respondeo around it.

◎ clinical_skeptic_88 (2) 2 days, 12 hours ago |

Null trials of mechanism-targeting interventions are the most underrated evidence class in psychology. We accept mediation models on observational data that a 1,200-person RCT can't reproduce.