How do we find ourselves in the early
twenty-first C century in the particular state we are in? And why do we have
the social predispositions that we do?
Humans have the capacity to acquire
variant traditions by imitation and teaching, and can accurately, quickly, and
selectively acquire the most common variant. The result is the cumulative
cultural evolution of complex, socially learned adaptations, adaptations that
are far beyond the creative ability of any.
However by 2004 there are very few
well designed studies that critically address competing hypotheses about the
source of human behavioral variation. It seems however that culture is adaptive
because it can do things that genes cannot do for themselves. And all
adaptations involve compromises and tradeoffs.
Flight allows birds easy escape from
many kinds of predators, and it makes long-distance migration practical.
However, birds operate under many design constraints necessary to make flight
possible in the low-density, low-viscosity medium of air. For example, their
bones must be light but rigid-constraints are met by the fact that their bones
are hollow tubes that, while light and rigid, are very delicate, failing
catastrophically when bent, like aluminum lawn furniture.
But when culture gives us the ability to
imitate things essential to human life, doesn’t it also makes us take up bits
that cripple and kill-not unlike like the air we breathe?
It is argued that most of the information
necessary to construct what we call culture is latent in genes shaped by
Pleistocene environments. John Tooby and Leda
Cosmides seem to believe that little post-Pleistocene behavior can be reliably
predicted by adaptive considerations. Human behavioral ecologists, by contrast,
cite evidence that traditional Holocene societies often seem to behave quite
adaptively compared to modern societies. In either case, explanation rests on a
direct interaction between individual minds and the "environment,"
not on the evolutionary dynamics of culture.
Modern societies might have a higher
frequency of maladaptive cultural variation given that the ratio of nonparental
to parental cultural influence has increased so dramatically. The use of mass
media for advertising fitness-
During 2004 most available Mathematical
models in fact are shorn of all the rich detail that makes people themselves so
interesting. Foolish indeed are the mathematical modelers who confuse their
abstractions with reality. But when used properly, mathematics schools our
intuition in ways that no other technique can.
And maybe bit by bit, models can be used
to dissect the logic of complex systems. The sharp contrast between the
difficulty of making good models and their manifest simplicity compared to the
phenomena they seek to understand is a humbling.
Alan Rogers's simple model in which
social learning evolved without being adaptive led to some insights into
exactly what properties are needed for culture to be adaptive.
Foolish, of course, is the empiricist
who thinks that even the most beautiful set of data captures any complex
phenomenon completely, especially one who thinks that the data from his own
case applies without exception to a diverse system such as human culture.
However, data are the ultimate arbiter. More than just testing hypotheses, data
often start us thinking in the first place.
But the importance of cultural variation
in the human species is hardly more dubious than role of gravity in the motions
of the planets.
But the world is so complex that without
sound empirical data the theorists are blind. Those who claim to study
unquantifiable complexity are being unreasonable, for quantifying is precisely
what we do when things get complicated.
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