FROM THE MARGINS
In my last column I ended with alleged sex and racial differences in IQ (the 'g'- factor) on the table for discussion. Along the way I mentioned in passing a number of controversial issues in the field ranging from whether (1) a general intelligence, a so-called g-factor - or at least a limited number of sub-g factors - actually existed, (2) whether they were at least partially heritable, (3) whether educational, nutritional and similar interventions could affect 'g', (4) whether 'g' was important and, finally, (5) whether the heritable component of 'g' could be entirely eliminated by environmental interventions.
Research strongly suggests 'yes' to numbers 1-4 and a possible 'no' to number 5. Issue 4 definitely holds true at least in modern times and probably to a variable extent in all Homo sapiens societies from hunter-gatherer to complex democracies. I don't want to oversimplify these conclusions. Intelligence is a remarkably subtle and complex field and work is on-going on all aspects from various perspectives.
But the focus here is on how do these issues get played out in the context of two major ideological splits in Western society which, for convenience, we'll call 'progressive' and 'conservative' despite the fact that neither term is adequate. A finer-grained resolution would reveal significantly different flavours within each group and the extremes of each resemble each other more than the centrist or moderate opinions within each broad camp. To get some idea of the tone of the debate, even between experts I will draw upon 2 recent events.
In November 2007 The Cato Institute (Cato Unbound) invited a small panel of IQ experts to comment on the topic "The IQ Conundrum" which can be found here. The lead essay was by Flynn of the well-know and, often misunderstood, 'The Flynn Effect' referring to his demonstration of a steady improvement in IQ noted in many populations, especially those from developing countries, over a number of decades.
His conclusion was that it is impossible to know whether 'environmental/educational/cultural' influences do not underlie the apparently innate component of 'g' and thus to claim innate differences between 'races' is premature and prejudicial. That seems a perfectly legitimate position to take and so was the rebuttal by the well-known 'g' theorist, Linda Gottfredson who argued that the Flynn effect didn't, and couldn't, overcome the innate differences documented though the gap may lessen significantly with time and appropriate existential changes.