I am not just kidding. Flynn uncovered in the early 80s that individuals' IQs gained about 3 pts per decade (Box 13, pg 74). Nearly 30 years later professionals within clinical psychology, education, law, and healthcare still ignore the impact of the Flynn Effect on their respective cognitive measurements.
He documents the critical consequences of ignoring the Flynn Effect. In the US any criminal with an IQ two full standard deviations below the average (IQ of 70) is deemed incompetent to stand trial and exempt from the death penalty. But, the majority of IQ tests are obsolete. An individual can get an IQ score of 76 (6 pts above incompetence) solely because of the test being outdated. Educators' assessment of children being gifted or cognitively impaired can be highly inaccurate. Giving an old test to children inflates their IQs. As a result, the selected gifted group will be far larger than it should be and many of the children needing special assistance will be ignored. The Flynn Effect also affects memory loss tests. And, health care professionals routinely administer obsolete tests. By doing so, they diagnose elderly individuals as doing just fine when they do need assistance in living.
Flynn proposes two solutions to resolve the Flynn Effect. The first one is updating tests frequently. The second one is adjusting scores downward by 0.3 pts per year. So, someone with an IQ of 120 associated with a test normed 20 years ago would have an adjusted IQ of 114. Somehow, the professions have rejected either approach.
Flynn considers intelligence a relative concept that needs to factor age of individuals (cognitive capabilities have their own lifecycle) and contemporary social context (Flynn Effect). Our society has become increasingly complex especially at work. And, that is the primary cause of our increasing IQ scores over time. Are we getting smarter? On page 163, he answers his own question: "I cannot give an absolute measure of the ability to classify or use logic... but I can say we are much better at both today than our ancestors were in 1900." So, the straightforward answer is "yes, we are."
Flynn contemplates whether developing nations will catch up with developed ones on IQ tests. He debunks many arguments related to climate, nutrition, and health; as he finds they do not cause IQ increases. Instead, IQ results from GDP growth that entails a society becoming increasingly complex. He notes that the IQ of developing nations is often rising rapidly. But, so are the ones of developed countries (Box 11, pg. 57). The issue is whether the societies of the developing world will catch up to the complexity of the developed ones. Some will and make the transition from developing to developed countries such as many Southeast Asian countries have.
Flynn observes that IQ changes with age, especially IQ subcomponents. And, the aging pattern is different for individuals of various brightness levels. The very bright tend to lose more of their analytical skills with age than the not so bright ones. This is because they progressively lose some of their analytical skills upon retirement. The remedy for them is to simply remain actively engaged in research and studies throughout retirement as he has done himself. Flynn is 78. But, with more leisure time in retirement, bright people communicate and socialize more. So, their vocabulary keeps on improving (Box 24, pg. 116).
Flynn observes that girls are far better students than boys. In all reviewed countries, girls have a huge advantage in reading (Box 31, pg 148). Better prepared, many more females go on to university than males. Yet, males average IQs in university are much higher than females. So, some derive that men are more intelligent than women. This is wrong. The males that go on to university represent a smaller self-selected sample than the females. It only makes sense that their average IQs would be higher than females. Flynn notices that in developing countries, women IQs are often lower than men. But, this is solely due to their being deprived of education and working opportunities. Flynn states on pg 157: "I believe that whether or not women achieve [IQ] parity with men is a good test of whether a society has achieved full modernity [men and women civil rights equality].
Flynn explains the superiority in academic achievement of the Asian Americans. By the 1980s, they represented only 2% of the American population, but already accounted for 14% of the students at Harvard, 16% at Stanford, 20% at MIT, 21% at Cal Tech, and 25% at Berkeley (pg. 177). Today all those percentages are much higher. Many believe this group has a far higher IQ. Flynn suggests this is not the case. Just like women are better students and are over-represented vs men in universities so are Asian Americans vs other Americans. It is the exact same issue. Both groups, women and Asian Americans study a lot harder than their counterparts. As a result a far larger percentage of their respective population goes onto universities. It is just that this trend is even more pronounced for the Asian Americans. Flynn states: "... it was not higher IQ scores but sociology of the family [tiger-moms and overall work ethics] that explains the remarkable academic achievements of the Asian Americans."
Within the nature-vs-nurture debate Flynn falls strongly on the nurture side. For him, nurture is having the opportunity to live and work within a complex society. Thus, Flynn weighs much less than his counterparts on nature (intelligence being inherited). Yet, when he addresses the studies on twins (pg. 167 - 169) that demonstrated that nature was a very strong factor (twins brought up apart end up having the same IQ regardless of environmental circumstances); he appears hard pressed to effectively rebut it. He goes on a long explanation regarding an "individual multiplier" that actually confirms the very "nature" argument he attempts to rebut.
In the end, intelligence is probably much less inherited than Flynn's counterparts (Jensen, Murray) suggest; but it is much more than Flynn advances. If you find this topic interesting, I also recommend Flynn's earlier book What Is Intelligence?. If you want to study the other side of the argument check out Murray's recent book Coming Apart: The State of White America, 1960-2010.