#78. My Thinking on Evolutionary Psychology: Summary to Date

EP

Red, theory; black, fact

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

#69. Role of Personalities in the Human Swarm Intelligence [population]

PO

Red, theory; black, fact

Each of the Big Five personality traits may be a dimension along which people differ in some socially important behavioral threshold. These are, respectively: openness > uptake of innovations; conscientiousness > uptake of taboos; extraversion >  committing to collectivism*; agreeableness (-) > becoming militant; neuroticism > engaging in/submitting to persecution. The personality trait is written on the left of the ">" and the putatively impacted social threshold is on the right.

These threshold spectra may enable social shifts that are noise-resistant, sensitive to triggers, and rapid. Noise resistance and sensitivity together are called good “receiver operating characteristics,” a concept often used in the scientific literature.

A metaphor that suggests itself is lighting a camp fire. The spark is first applied to the tinder. Ignition of the tinder ignites the kindling. Ignition of the kindling ignites the small sticks. Ignition of the small sticks ignites the big sticks, and everything is consumed.

Orderly fire-starting appears to require a spectrum of thresholds for ignition in the fuel, as may orderly social shifts. To further extend the metaphor, note that the fuel must be dry (i.e., situational factors must be permissive).

Social novelties may spread upward to higher-threshold social strata by meme propagation reinforced by emotional contagion. The emotional energy necessary for emotional contagion would come from the individual’s interaction with the novelty, which would feature a positive feedback.

The governing neuromodulators of personality may be as follows:

• Acetylcholine-Openness
• Noradrenalin-Neuroticism 
• Serotonin-Agreeableness 
• Histamine-Conscienciousness
• Dopamine-Extraversion 

Our capacities for all of the enumerated social shifts were selected in evolution and most can be assumed to be still adaptive when correctly triggered. In today’s world, shifts to persecution are probably the least likely to still be adaptive, and could be a holdover from our Homo erectus stage. Persecution leads to refugee production, and refugee production could have been the reason that guy was such a great disperser.

As the geologists say, “The present is the key to the past.”

* A possible anti-invasion adaptation and predictable from geography. The sociological term for the corresponding failure mode may be siege mentality.

# 54. Disaster Biology [evolution, evolutionary psychology]

EP    EV 

Red, theory; black, fact

The habitat may have been a unit of selection in early hominins, leading to group selection, and much of our evolution may have proceeded by an accumulation of founder effects.

Opportunities for colonization of recently-emptied habitats are ephemeral. Under disaster-prone conditions, this plausibly leads to selection pressure for migrant production and evolvability (i.e., a high rate of evolution, especially founder-effect evolution).

Language diversification in humans may be an evolvability adaptation. Language diversity would work by preserving genetic founder effects from dilution by late-coming migrants, whose reproduction would be held back by the difficulties of learning a new language. Xenophobia and persistent ethnicity markers can be explained in the same way. The spread of linguistic and cultural novelties in a hominin population is predicted to be especially fast in newly colonized, previously empty habitats. Alternatively, the linguistic novelties may start as a thick patois developed by an oppressed group in the home habitat prior to becoming refugees, as a way to make plans "under the noses" of the oppressing group.

Refugee-producing adaptations sub-serving dispersal can be called "tough altruism." Populations producing more refugees are more likely to colonize further empty habitats, a selective advantage.

Disaster biology may be what is conceptually missing from theories of the origin of life (abiogenesis). i.e., the forerunners of the first cells may have been spores that formed by budding from the surface of bodies of water.

Photo by Purnomo Capunk on Unsplash