Norsemaiden
barbarian
EVOLUTION AND CULTURE: THE MISSING LINKCultural traits varied in significance; there were relatively trivial ones (innovations such as the spread of CocaCola, volleyball etc.) where participation in the trait could not appreciably alter the probability of surviving or having children; in these instances some kind of non-Darwinian selection was involved which they termed 'cultural'. Other traits were important elements of culture (notably language); these were subject to processes analogous to those in biological evolution to which the concepts of drift and migration could be applied. Cultural selection could act counter to natural selection, although harmony between the two was expected on average, based on the assumption that the neural structures or mechanisms that permit choice evolve under the control of natural selection which thus indirectly controls the scope of cultural choices made.
Lumsden and E.O. Wilson (1981, 1983) postulated that human cultural transmission is ultimately gene-culture transmission. Their aim was the technical development of a theory of gene- culture coevolution, a first attempt to trace development all the way from genes through the mind to culture. The approach, similar to that of Cavalli-Sforza and Feldman though more mathematically ambitious, centred round the concept of the culturgen [producing culture], the basic unit of inheritance. They derived the concept from the operational units of culture in archaeology (artifacts) but extended it to cover all kinds of transmissible behaviours, mentifacts, and artifacts, The transmission of culturgens was governed by epigenetic rules, the genetically determined peripheral sensory filters, inter-neuron coding processes, and cognitive procedures of perception, learning and decision-making. These together affected the probability of one culturgen being transmitted rather than another. Genetic and cultural evolution drive each other forward; culture is created and shaped by biological processes, while the biological processes are simultaneously altered in response to cultural change.
Genetic drift (an influence on evolution discovered post Darwin) is the process whereby certain genes become more predominant in one population than another, this is bound to happen in isolated groups and it has a much more rapid effect than natural selection.
When the effective population size is small, as was the case for humans in the past, genetic drift will be stronger. Culture would be affected by this.
Also, culture affects the evolution of those in the society, (not so much nowadays as everyone is getting so mixed up and subject to other cultures) so that certain behaviours are rewarded with reproductive success and others are not valued or are punnished, resulting in fewer genes for such behaviour being passed on. In a society that values creativity and inventiveness, the culture will be different to that of a society where inventive people are seen as dangerous freaks who may be possessed by demons or seen as a threat to a tyranical authority. After some time, the genes for creativity will be more common in the former society. Those from the latter will have a genetic tendency to admire brutal leaders and a difficulty in grasping the concept of how fairness and social justice makes society more pleasant to live in. (Although if anyone offers them personally some "fairness and social justice" they will be all for it, in a purely selfish way while still considering the tyrant to be the epitome of male status).