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A cultural evolutionary theory that explains both gradual and punctuated change.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Bentley, R Alexander  ORCID logo  https://orcid.org/0000-0001-9086-2197
O'Brien, Michael J 

Abstract

Cumulative cultural evolution (CCE) occurs among humans who may be presented with many similar options from which to choose, as well as many social influences and diverse environments. It is unknown what general principles underlie the wide range of CCE dynamics and whether they can all be explained by the same unified paradigm. Here, we present a scalable evolutionary model of discrete choice with social learning, based on a few behavioural science assumptions. This paradigm connects the degree of transparency in social learning to the human tendency to imitate others. Computer simulations and quantitative analysis show the interaction of three primary factors-information transparency, popularity bias and population size-drives the pace of CCE. The model predicts a stable rate of evolutionary change for modest degrees of popularity bias. As popularity bias grows, the transition from gradual to punctuated change occurs, with maladaptive subpopulations arising on their own. When the popularity bias gets too severe, CCE stops. This provides a consistent framework for explaining the rich and complex adaptive dynamics taking place in the real world, such as modern digital media.

Description

Keywords

cultural evolution, popularity bias, punctuated evolution, social learning, transparency, Humans, Cultural Evolution, Internet, Biological Evolution, Social Learning, Population Density

Journal Title

J R Soc Interface

Conference Name

Journal ISSN

1742-5689
1742-5662

Volume Title

19

Publisher

The Royal Society