Both facts that the Homo species hand ax was so widespread that it remained unchanged for 1.5 million years is attributed to the gregarious, noncompetitive nature of hominin groups.
Outline of Theory of Human Nature-3rd of Series: The Ascension of Individual Dominance into the Authority of Groups
The means by which dominance and submission between ape individuals metamorphosed into the single group structure of obedience to the authority of hominin groups.
Outline of Therory of Human Nature-2nd of Series: Schizophrenia and the Language of Our Ancestral Species
Outline of thinking that led to hypothesis that schizophrenia is an emotional fossil for the communication system of our ancestral hominin species.
Outline of Therory of Human Nature-1st of Series: Initial Influences, Validity of Method, Darwinian Psychiatry
Outline of Theory of Human Nature-1st of Series: Influences, Method, Feedback Reverberation, Emotional Fossils, Atypical Depression, Melancholia, Panic Disorder, Group & Hierarchy Formation
Ontology (the development of the individual) recapitulates phylogeny (the evolution of the species) is more applicable to the mind than the body. The process of identification in the oedipal complex is related to communication in early hominins.