In Catholic theology transubstantiation describes how during mass bread and wine are converted into the body and blood of Christ. For believers, how this happens exactly is a mystery. Also mysterious is how energy and information absorbed by an organism is converted into mental activity. …

Exploring human mentality’s evolution, this essay hypothesizes four types of bicameral mentality, their association with social complexities, and the continuity of lateralized brain structures shaping duplex psychology. Jaynes’ concept of a two-tiered mentality is linked to historical shifts and social control, with vestigial hallucinations and language intricacies playing fundamental roles. As human societies advanced, the essay traces a shift from external divine guidance to the rise of conscious interiority and self-reflexivity paralleling social and technological progress.

We accept as fact the magical transformation of species (Darwinian evolution), the warping of spatiotemporal fabric (Einsteinian astrophysics), and the superposition of particles and “spooky action at a distance” (quantum mechanics)….

A word of thanks to all those who tested their knowledge of Jaynes’s theory by taking the quizzes. In an earlier blog, “Julian Jaynes Is …