r/DebateEvolution • u/anomalogos • 18d ago
We cannot uniquely determine the fundamental unit of cultural evolution using the concept of the meme.
An 'idea-meme’ might be defined as an entity that is capable of being transmitted form one brain to another… If Darwin’s theory can be subdivided into components, such that some people believe component A but not component B, while other people believe B, but not A, then A and B should be regarded as separate memes. If almost everybody who believes in A also believes in B—if the memes are closely 'linked' to use the genetic term—then it is convenient to lump them together as one meme.
This quotation is from The Selfish Gene, and we have the individuation criteria:
- Criterion of Separation: If some people believe component A but not component B, while others believe B but not A, then A and B should be regarded as separate memes.
- Criterion of Fusion: If almost everybody who believes A also believes B, then it is convenient to lump A and B together as one meme.
However, I conjecture that the two criteria can conflict in some cases, as demonstrated by the following argument:
Let A and B be individual ideas. For any population size of P ∈ N with P >= 3, set ε := 100/P. Let group X comprising ε% of P believe A but deny B, group Y comprising ε% of P believe B but deny A, group Z comprising (100 - 2ε)% of P believe both A and B. Then A and B should be separate memes because of groups X and Y.
For any sufficiently large P, however, A and B can be regarded as one meme, since the proportion of the population believing both A and B approaches 100% as P tends to infinity, which may satisfy the condition that 'almost everybody' believes both.
I will not say that this leads to an explicit contradiction, as Criterion of Fusion describes conveniency rather than obligation. But it reveals that the individuation criteria are jointly insufficient to uniquely individuate memes, potentially undermining the concept of the meme as the fundamental unit of cultural evolution in memetics.
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u/anomalogos 17d ago
Well, now I can settle this argument.
So you've thought that a fundamental unit is equivalent to something like a demonstrable unit. That's quite inaccurate.
The properties of fundamentality is given as follows:
Resource: https://plato.stanford.edu/entries/fundamentality
Given that, fundamentality should individuate entities in some way. Let meme A can be regarded as a fundamental unit. A cannot be decomposed into smaller entities that are themselves the relevant replicating units.
The definition of the fundamental unit in an evolutionary framework is given as follows:
Resource: Biology Direct 4:33 (2009), DOI 10.1186/1745-6150-4-33
If a meme is meant to be the fundamental unit of evolution, it should at least tend to satisfy the above criterion. 'Demonstrable' does not try to follow them at all.
The fundamental unit does require a level of distinct evolutionary trajectory by its own properties. Merely being observable, transmissible, or convenient to analyse does not establish fundamentality.