Migratory selection for inversely related covariant T-, and IQ-Nexus traits: Testing the IQ/T-Geo-Climatic-Origin theory by the General Trait Covariance model

The IQ/T-Geo-Climatic Origin (GCO) theory admits that primordial northbound migration out of Africa increasingly demanded higher IQ and decreased aggression as temperatures sank. To organisms with a fixed intra-systemic energy budget, this meant that small-brained – High T (Lo-IQ/Hi-T)” masculine aggressive A5 males became too “expensive” in cold eco-niches, and were replaced by Low Testosterone androgyne A1 (Hi-IQ/Lo-T) light-weight males with sufficient energy for developing the large energy-greedy brain needed for survival during cold winters. The physiological re-balancing of T-Nexus and IQ-Nexus traits probably occurred during migration over the past 40,000 years.The moderate heritability of the traits leads us to expect that rudiments of this evolutionary progression can still be identified in contemporary geographic race and androtype distributions of inversely related T- and IQ-Nexus traits. Rushton’s three-racial ranking of Life History traits (Table 1 in Nyborg, this issue,) confirms this, as do analyses using the General Trait Covariance model on data for five races and pentile IQ bands.The evolutionary progression seems time-limited, however, as recent decennia witness a decaying Western civilization.

► The IQ/T-Geo-Climatic-Origin theory is tested.
► Primordial northbound migration selects inversely for IQ- and Testosterone-traits.
► Rudiments of this ancient evolutionary progression are still seen.
► Massive low-IQ immigration reverses this and erodes Western civilization.
► Below replacement fertility and high altruism reduce Western resistance to this.