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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