You can no longer comment on this thread as it was closed due to no activity for a month.
"In 1910, scored against today's norms, our ancestors would have had an average IQ of 70 (or 50 if we tested with Raven's). By comparison, our mean IQ today is 130 to 150, depending on the test. Are we geniuses or were they just dense?
Modern people do so well on these tests because we are new and peculiar. We are the first of our species to live in a world dominated by categories, hypotheticals, nonverbal symbols and visual images that paint alternative realities. We have evolved to deal with a world that would have been alien to previous generations. A century ago, people mostly used their minds to manipulate the concrete world for advantage. They wore what I call "utilitarian spectacles." Our minds now tend toward logical analysis of abstract symbols—what I call "scientific spectacles." Today we tend to classify things rather than to be obsessed with their differences. We take the hypothetical seriously and easily discern symbolic relationships."