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The dynamics of Machiavellian intelligence
1Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996, USA. sergey@tiem.utk.edu
Summary
The "Machiavellian intelligence" hypothesis suggests social competition drives cognitive evolution. A mathematical model shows intelligence, learning, and brain capacity can rapidly increase, but brain size costs may later limit abilities.
Area of Science:
- Evolutionary psychology
- Cognitive science
- Mathematical modeling
Background:
- The "Machiavellian intelligence" hypothesis proposes intense social competition as the driver for the evolution of large brains and advanced cognitive abilities in humans.
- This hypothesis suggests that sophisticated "Machiavellian" strategies evolved to enhance social and reproductive success.
Purpose of the Study:
- To explore the "Machiavellian intelligence" hypothesis using a mathematical model.
- To investigate the evolutionary dynamics of cognitive abilities, including learning and cerebral capacity, driven by social competition.
Main Methods:
- Development of a mathematical model where genes influence brains, which create and learn strategies (memes).
- These memes are utilized by males for advantages in mate competition.
- Analysis of the model to identify distinct phases of intelligence evolution.
Main Results:
- The model demonstrates three phases of intelligence dynamics: dormant, cognitive explosion, and saturation.
- During the cognitive explosion, meme count, learning ability, cerebral capacity, and Machiavellian fitness increase rapidly.
- The saturation phase shows natural selection limiting cognitive increases due to the costs of large brains.
Conclusions:
- The "Machiavellian intelligence" hypothesis mechanisms can explain the evolution of significant cognitive abilities within 10-20 thousand generations.
- Cerebral capacity evolves more rapidly and to a greater extent than learning ability.
- Potential for reduced cognitive abilities in modern societies due to decreased reproductive advantage of large brains and increased meme exposure.
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