SSC Journal Club: Childhood Trauma And Cognition

A journal-club on Danese et al, 'Origins Of Cognitive Deficits In Victimized Children.' Prior cross-sectional work found abused children have lower IQ and inferred abuse-stress damages the brain; Danese et al used longitudinal data (IQ measured before and after abuse onset) and found that after adjustment the IQ gap vanished (p=0.13) -- the deficits were largely PRE-EXISTING, consistent with the high heritability of cognition plus socioeconomic confounds, not caused by the abuse. Scott frames this as the shared-environment-skeptical paradigm done right (route around the interminable twin-study-denial debate with rigorous non-twin designs), reviews adjacent findings axis-by-axis (abuse doesn't raise ADHD/autism risk [expected], or conduct problems [interesting], and explains ~1% of personality-disorder variance [surprising], though several are not genetically controlled), and balances honestly: small severe-abuse samples may understate harm, and abuse rising to trauma plausibly produces a PTSD-like picture -- just not lowered IQ.

Quality 70 · Strong. A rigorous, well-balanced treatment of an emotionally charged behavioral-genetics question, with good methodological framing (non-twin replication of twin-study conclusions; the axis-by-axis breakdown; honest caveats about genetic confounding and sample size). Strong; it contextualizes one study within an existing paradigm rather than offering a major original result.

Claude’s paradigm shift 48 · Moderate. Reports and synthesizes a study within the Harris/behavioral-genetics shared-environment-skeptical paradigm, which is not Scott's; modest synthetic novelty. Moderate.

Real-world impact 2 · Minor. A within-discourse journal-club; no material-world effect. Within-blog influence.