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Crystallized and Fluid Intelligence<br />
The Kaufman Adolescent and Adult Intelligence Test (KAIT) introduces the concepts of fluid,<br />
crystallized, and composite intelligence. In brief, crystallized intelligence is the knowledge that a<br />
person has accumulated throughout their lifespan. This means that a person who goes to college,<br />
reads lots of books, etc. is probably going to have more crystallized intelligence than a person who<br />
spends all their time staring at a wall. Fluid intelligence, by contrast, is the ability to solve<br />
problems without the help of a preexisting knowledge base. A person who spends all their time<br />
staring at a wall can still have more fluid intelligence than a person with a college degree.<br />
1,297 people of various ages and sexes took the KAIT. INs tended to do the best overall, followed<br />
by ENs, then ISs, then ESs. 196 Intuition, however, was the real determinant of how well one scored<br />
on this test—a finding that has oft been repeated in scientific literature. This likely hearkens back<br />
to the tendency to define intelligence as "abstract reasoning skill."<br />
One additional, intriguing finding was that the participants in the study (who ranged from teenagers<br />
to octogenarians) tended to become more Judging as they aged. It would seem that people tend to<br />
place more value on regular routines as they grow older. The E/I, S/N, and T/F functions were not<br />
affected by aging.<br />
INTJ Geniuses<br />
One of the best ways to differentiate between type and intelligence is to study extremely intelligent<br />
people of a particular type. Oftentimes, people mistakenly point to manifestations of type as being<br />
due to "genius" when they are actually very ordinary characteristics of type. For example, a<br />
researcher may observe an INTJ genius reading the encyclopedia for fun and attribute this behavior<br />
to high intelligence. In reality, INTJs of all intelligence levels have a thirst for knowledge, though<br />
in our modern times the encyclopedia has been replaced by Wikipedia. The genius' intelligence<br />
does allow them to imbibe knowledge more quickly and retain it more easily than for ordinary<br />
INTJs, but the unending desire for information comes from type, not genius. Indeed, geniuses of<br />
other types may have no interest whatsoever in reading or science.<br />
As we shall see, there isn't much difference between the behaviors of geniuses and those of average<br />
members of the type. INTJ geniuses are not so much different as better. Indeed, above-average<br />
INTJs may find that some of the problems which INTJ geniuses struggle with are the same ones<br />
that they themselves struggle with, only magnified into dramatic proportions. By studying these<br />
outliers, we can learn quite a bit about the problems faced by average INTJs.<br />
In this section, we’ll review the traits of two individuals with genius IQs whom I believe to be<br />
INTJs. At the time their cases were reviewed, neither had achieved fame or made a significant<br />
contribution to science. Nevertheless, their stories are interesting because they illustrate the<br />
manifestations of high intelligence as expressed through the INTJ personality.<br />
Note that an IQ of 100 +/- 15, is considered average. An IQ over 180 is found in something like 1-3<br />
people in a million. Both children (C and L) were first described by Leta Hollingworth in 1942.<br />
196 Kaufman, McLean & Lincoln, 1996