Abstract. An idea is not a replicator because it does not consist of coded self-assembly instructions. It may retain structure as it passes from one individual to another, but does not replicate it. The cultural replicator is not an idea but an associatively-structured network of them that together form an internal model of the world, or worldview. A worldview is a primitive, uncoded replicator, like the autocatalytic sets of polymers widely believed to be the earliest form of life. Primitive replicators generate self-similar structure, but because the process happens in a piecemeal manner, through bottom-up interactions rather than a top-down code, they replicate with low fidelity, and acquired characteristics are inherited. Just as polymers catalyze reactions that generate other polymers, the retrieval of an item from memory can in turn trigger other items, thus cross-linking memories, ideas, and concepts into an integrated conceptual structure. Worldviews evolve idea by idea, largely through social exchange. An idea participates in the evolution of culture by revealing certain aspects of the worldview that generated it, thereby affecting the worldviews of those exposed to it. If an idea influences seemingly unrelated fields this does not mean that separate cultural lineages are contaminating one another, because it is worldviews, not ideas, that are the basic unit of cultural evolution.Keywords: associative network, acquired characteristics, autocatalytic closure, conceptual closure, culture, evolution, idea, origin of life, replicator, self-replication, worldview.
Does Culture Evolve like Biological Lineages Do?It is clear that cultural entities (such as ideas, habits, mannerisms, attitudes, and languages, as well as artifacts such as tools and art) evolve in the general sense of incremental change reflecting the constraints and affordances of an environment (Campbell 1987;Csanyi 1989;Cziko 1997;Gabora 1997;Hull 1988a;Lorenz 1971;Lumsden and Wilson 1981;Plotkin 1997;Popper 1963; Hofbauer and Sigmund 1988). Ideally we could flesh out a theoretical framework for this process that unifies the psychological and social sciences as did the theory of evolution for the biological sciences. Accordingly, there have been attempts to develop formal mathematical (Boyd and Richerson 1985;Cavalli-Sforza and Feldman 1981;Schuster and Sigmund 1983) to as memes (Aunger 2000;Blackmore 1999Blackmore , 2000Dawkins 1976;Dennett 1995;Gabora 1996) as well as to the analysis of growth and change in economics (Borgers 1997;Borkar et. al. 1998;Metcalfe 2001;Rivkin 2001;Saviotti and Mani 1995;Witt 1992), financial markets Lo 1999), social customs (Durham 1991;Marsden 2001), art (Sims 1991, and the design of artifacts in primitive societies (Lake 1998). However, the endeavor to frame culture in evolutionary terms has not taken hold. It certainly hasn't had the effect of uniting previously disparate phenomena and paving the way for further inquiry, the way Darwin's theory of how life evolves through natural selection did for biology....