Lead agent: Evolutionary Psychologist
HYBRID model: Theta_total = Theta_fixed_floor + Theta_variable(culture,t). Most 'constants' have a genetic floor plus cultural overlay — resolves the micro/constants boundary dispute.
alpha_recip ~ Normal(0.45, 0.08): Spadaro et al. 2022 meta-analysis across 70 societies and 1,506 studies — 'very little cross-societal variation in impersonal cooperation.' Strongest cross-cultural validation in the formula.
theta_boundary fractal layers [5/15/50/150/500/1500]: scaling ratio ~3.0 validated across phone networks, online platforms, and face-to-face groups. The specific '150' is contested (Lindenfors 2021 CI [4-520]) but the ratio is robust.
h2_behav ~ 0.49 overall behavioral heritability across 17,804 traits (Polderman 2015, 14.5M twin pairs). Gene-culture coevolution >500 generations means Theta_fixed stable across entire historical test suite.
C6-1: alpha_auth HYBRID math must reconcile with micro.md Beta(4,3) distribution
C6-2: gamma_conf_effective needs min(1.0, ...) cap to prevent overflow
C6-4: Effective free parameter count (~25-30) must be disclosed — nominal 9 params decompose to much more
C6-5: xi_scarcity falsification criterion added (cross-cultural replication required)
C-7 PARTIALLY MET: 4-layer architecture maintained at preliminary-estimates stage
Session 6 addressed the oldest outstanding structural gap. The Philosopher of Science had issued an ultimatum after Session 3: if Theta_fixed — the evolutionary constants layer — remained entirely undefined by Session 6, the 4-layer architecture claim would be downgraded. The Evolutionary Psychologist ran with maximum urgency.
The key conceptual contribution was the HYBRID model: instead of dividing parameters into 'fixed constants' (in constants.md) and 'variable parameters' (in micro.md) as two separate files, most behavioral traits have a fixed genetic floor plus a culturally-modifiable overlay. Theta_total = Theta_fixed_floor + Theta_variable(culture, t). This resolves a 5-session dispute about whether alpha_auth (authority deference) belongs to the constants or the micro layer — it belongs to both.
Nine parameters were defined, including the session's strongest finding: alpha_recip ~ Normal(0.45, 0.08), the reciprocal altruism threshold. Spadaro et al. (2022) meta-analyzed 1,506 studies across 70 societies and found 'very little cross-societal variation in impersonal cooperation.' This is one of the most cross-culturally validated parameters in the entire formula — a genuine human universal.
The Philosopher found C-7 PARTIALLY MET: the 4-layer claim survives, but at 'preliminary estimates' status. Seven mandatory caveats were issued, including a critical observation: the 9 nominal parameters decompose into ~25-30 effective free parameters once the HYBRID floor/overlay structure is counted properly. The formula's parameter explosion problem was becoming harder to ignore.