I now have data on nine people who have taken both my jig-saw and an undergraduate college admission test (SAT/ACT).

Because age has an acute effect on jig-saw, I converted all jig-saw scores to age adjusted jig-saw scores by deducting 0.33 points points for each year below 32 you are when you took the test (up to a maximum of seven years). I also added 0.33 points for each year above 32 (no maximum).

Thus if you only solved the red puzzle (six pieces) and thus got a score of 6, but you’re 60-years-old (28 years above 32) your age adjusted score becomes 6 + 0.33(28) = 15.

Then using equipercentile equating, I equated the nine age adjusted jig-saw scores with the IQ equivalents of the SAT/ACT scores in the same sample.

The result is the following formula for deriving spatial IQ (U.S. norms) from age adjusted iig-saw puzzle scores:

Spatial IQ = 2.01(age adjusted jig-saw score) + 71.16

To be clear, age adjusted score is simply the score you would have got if you too the test at 32. If you are 32, no need to age adjust.

I other words (at age 32):

If future research replicates these studies, the results have vocational implications. For example, in the past if you had a verbal IQ of 110 and a spatial IQ of 110, it would make just as much sense to pursue a verbal career as a spatial one, since you’re at the 75th percentile in both domains.