Before revision: Flynn notes that this effect apparently contradicts some fundamental beliefs about IQ long held by human intelligence researchers, and categorizes these contradictions into four seeming "paradoxes": the factor analysis paradox - past research has shown evidence for a single factor, "g" or general intelligence, underlying IQ.
After revision: Flynn notes that this effect apparently contradicts some fundamental beliefs about IQ long held by human intelligence researchers, and categorizes these contradictions into four seeming "paradoxes": the factor analysis paradox – past research has shown evidence for a single factor, "g" or general intelligence, underlying IQ.