Red, theory; black, fact
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| Darwin's first diagram of evolution |
The behavioral innovations occurring in the evolutionary sequence leading to ourselves may have been, in chronological order:
- H. habilis: tool manufacturing and gender roles.
- H. erectus: systemic refugee production, dispersal, ethnicity, and language.
- Early H. sapiens: warfare, shelter building, and tricksterism.
- Late H. sapiens: siege resistance and religion.
General hypotheses: 1) The earlier the innovation, the less modifiable it will be; 2) The dominant neuromodulators that organize the innovations emerging post-H. habilis will be noradrenalin (primordial organizer of responses to intraspecific competition) and serotonin (primordial organizer of responses to predation). 3) Siege resistance is the adaptive form of the corresponding failure mode siege mentality.
Picture credit: Wiki Commons
