Master Chronology — Verified Spine v0.2

Factual chronology first. Intellectual arrows are maintained separately in the relationship register.

2004–2010 — Ecological, transactional, and developmental-trajectory foundations

2004 — Prospective work links community violence exposure with school functioning.
2006 — Multilevel ecological analysis incorporates schools, parents, and youth violence.
2007 — Home and childcare/school environments are examined against differential externalizing trajectories.
2008 — Transactional parent-adolescent relationship and adjustment models.
2009 — CU traits and different forms/functions of aggression; parallel work on friendship and media-violence desensitization.
2010 — Latent-class growth analysis of pure/co-occurring internalizing and externalizing trajectories; transactional bullying/victimization work. The Developmental Psychopathology Lab is established around this period.

2012–2014 — Subtyping and reciprocal family processes

2012–2013 — CU/psychopathic traits increasingly differentiate aggression/conduct-problem groups; primary/secondary variants and broader environmental correlates are tested.
2014 — Bidirectional parenting-distress/conduct-problem effects are examined in relation to CU development, keeping family transactions inside the explanatory model.

2015–2017 — Physiological differentiation of heterogeneous pathways

2015 online / 2016 issue — The better of two evils? tests a fear–fearlessness continuum: persistent CP/high-CU children show fearlessness while persistent CP/low-CU children show high fear/inhibition. This is an explicit equifinality result.
2016 — Neurocognitive deficits in decision making/attention/future orientation do not cleanly differentiate all CU-defined conduct-disorder subtypes, creating an early specificity constraint.
2016–2017 — Facial response, startle, and broader psychophysiology studies test affective under-reactivity and impulsive/aggressive reactivity across dimensions.
2017 — Primary/secondary juvenile psychopathy variants show different affective-startle patterns in incarcerated boys.
2017 — CU, impulsive-irresponsible, and grandiose-manipulative dimensions show different associations with heart rate, skin conductance, and startle.

2018–2019 — Multi-system synthesis and biomarker constraint

2018 — Review explicitly organizes conduct-disorder psychophysiology around heterogeneity rather than one biological profile.
2018 — Children and young adults classified as low-risk, anxious, primary, or secondary are compared across autonomic/startle measures and, in adults, prefrontal activity.
2018 — School-based pilot prevention provides an intervention branch outside neurotechnology.
2019 — Systematic review/meta-analysis of 66 studies (N=10,227) finds autonomic effects dependent on measure/task/design; no universal case-control baseline or heart-rate difference emerges.
2019 — VR is used to elicit fear while measuring autonomic response to psychopathy dimensions. At this point VR is primarily an experimental environment, not established treatment.

2020–2021 — Neural and attentional mechanism branching

2020 — Amygdala acquisition/extinction research differentiates antisocial subtypes during threat learning.
2020 — Eye-tracking work finds emotion-recognition differences across CU variants but does not support a simple eye-region-specific deficit.
2020 — cTBS of DLPFC experimentally changes selected facial-emotion recognition outcomes, crossing from neural association to causal manipulation of a proximal mechanism.
2021 — CU-related physiology is tested against autistic traits, probing specificity and interaction rather than assuming one diagnostic pathway.
2021 — LPE/CU-related socioemotional neural processing includes patterns of increased prefrontal recruitment, constraining a generalized neural-hypoactivity account.

2022–2024 — Developmental extension, transactional reintegration, and targeted mechanism intervention

2022 — Psychopathy dimensions are extended into childhood using heart rate, skin conductance, and startle, showing dimension-specific associations earlier in development.
2022 — Child eye-gaze studies further test reduced attention to eyes/emotional expressions.
2023 — Preschool children with clinical conduct problems show atypical facial reactions, but CP+CU and CP-only groups do not significantly differ, limiting CU-specific interpretation.
2023 — Physiological fear reactivity moderates associations between parental distress and later conduct/prosocial behavior, explicitly reconnecting physiology with environmental susceptibility.
2023 — Facial-mimicry / emotion-recognition manipulation provides another proximal experimental route into emotional processing.
2024 — INTERFEAR formalizes fearlessness, parenting, CU development, and conduct problems in a multiyear transactional model.
2024 — Multi-method CU/LPE assessment shows that detected gaze abnormalities depend on operationalization; emotion-recognition accuracy does not differ between high- and low-CU groups in that sample.
2024 — Parent-child interventions targeting sadness processing improve proximal recognition accuracy and skin-conductance response, moving a candidate emotional mechanism into intervention.

2025–2026 — Combined technology and explicit translational synthesis

2025 — cTBS + attention-modification research shows measurable attentional/gaze effects but no superiority of active over sham cTBS for self-reported anxiety in the cited feasibility trial.
2025 — Additional cTBS work tests DLPFC contributions to emotional attention.
2026 — EFCAP/EAPL presentations explicitly assemble cognitive modification, VR, HRV/biofeedback, and non-invasive stimulation into a neuroscience-informed, technology-enhanced intervention program.

Chronology-level conclusion

The record now supports two persistent, interacting foundations rather than a replacement story:

developmental / transactional ecology

and

heterogeneity / CU / psychopathy differentiation.

From roughly 2015 onward, psychophysiology and neuroscience provide increasingly specific tests of mechanisms; by 2020 selected mechanisms are causally manipulated; by 2024 they are being used as intervention targets. The evidentiary chain to durable behavioral or forensic effectiveness remains incomplete and must be mapped intervention by intervention.