I have been reading through the forums and also online about the FSIQ and GAI. From what I've read it seems like the GAI typically winds up being several points higher than the FSIQ. My ds has the opposite results and I can't seem to find anything about why that might be or how to interpret the score. Something that has been mentioned is a possible LD.
His FSIQ is 146, his GAI is 135.
Can anyone clarify or direct me to a reference that can explain what this might mean? The tester had no information, just explained why they calculated the GAI, and we're not sure where to go next.
Thanks!
The general ability index tends to be higher than the full-scale IQ in high IQ persons because the tests that enter into it are more g-loaded, on average, than those of the full-scale IQ. For example, the general ability index is measured by highly g-loaded tests such as vocabulary, similarities, matrix reasoning, and the like, while excluding low-level processing tasks such as digit span, coding, and et cetera. Still, full-scale IQ is a better estimate of Spearman's g than is the general ability index because of the greater generality of the tasks that enter into it.
Based on the scores you listed, I've calculated your son's CPI as being about 163. That means that his aptitude for low-level processing tasks is exceptional. Perhaps if you list his actual test scores I can make a more comprehensive statement about his abilities.
