This report contains some information on the very highest test scores having occurred from 1995 to present. The cutoff for inclusion is I.Q. 170, which corresponds to protonorm 620 according to the current norms. The I.Q. range 170-179 is tentatively called "pervasive intelligence" (a few scores are actually in the 180+ range, called "exceptional intelligence", but it is not a priori so that higher scores have extra significance in this report). Considered are only scores on tests containing at least two different item types, when items are classified by their appearance as either verbal, numerical, spatial, or logical. Such heterogeneous tests have proven to be more robust, valid, and reliable than are homogeneous tests (with only one item type). Tests of which the norms are still of doubtful quality, and/or that may have too low ceilings, have not been considered.
There are 20 scores in this range, following above criteria. Their exact distribution, the norming of tests in this range, and the question whether higher scores within this range also mean greater ability, are not topics of this report. Those matters are dealt with, when possible, in the statistical reports for the tests in question, and in the report on the norming of protonorms to norms. When norms change, the number of scores that fall at or above I.Q. 170 may naturally change. Considering the rareness of these scores, it should best be assumed that the current norms within this range are not good enough to distinguish well between the corresponding performances, and that this may improve with future renormings.
The incidence of these scores among all of the obtained scores since 1995 is about 1 in 231; if homogeneous (one-sided) tests were included, it would rise to about 1 in 83.
The 20 scores have been obtained by 14 candidates:
All of the scores have been obtained by males.
|Age class||# scores|
|Birth year||# scores|
|Cooijmans Intelligence Test - Form 1||****|
|Test For Genius - Revision 2004||***|
|The Nemesis Test||**|
|Long Test For Genius||**|
|Short Test For Genius||*|
|Cooijmans Intelligence Test - Form 2||*|
|Cooijmans Intelligence Test - Form 3||*|
|Reason Behind Multiple-Choice - Revision 2008||*|
|Test of the Beheaded Man||*|
|Cooijmans On-Line Test - Two-barrelled version||*|
|Narcissus' last stand||*|
|Secondary school completed||***|
A total of five scores are from three candidates who report having a psychiatric disorder (in no case of the psychotic kind) and one of those five scores is from a candidate also reporting the presence of such disorder among parents and/or siblings.
Four of those five scores are from (two) candidates who have been observed displaying neurotic behaviour; no candidates have been observed displaying psychotic behaviour (which is otherwise not uncommon among test candidates). One of the five scores (from the candidate also reporting the presence of disorder among parents and/or siblings) is from a candidate who has committed suicide.
The majority of scores therefore are from candidates with no disorders in themselves or relatives, and with no observed disordered behaviour.
Insofar candidates have taken personality tests like Personality Scales for Intelligent Adults and Gifted Adults' Inventory of Aspergerisms, their scores are on the whole remarkably normal, around average, the only thing that stands out being that the majority of them are (compared to high-range test candidates) below average on indicators of deviance. Three candidates are above average on those though.
Regarding observed behaviour, remarkable in all but one of these fourteen candidates is the absence of negativity and rudeness, and the on the whole positive, polite, constructive attitude.