<p>“it’s still true that a lack of IQ is a limiting factor, just like lack of height.”</p>
<p>I agree. It’s obvious that someone with below average intelligence is not going to make it as a brain surgeon. So when you’re dealing with an IQ of, say, under 100, it’s a pretty sure bet that that person isn’t going to do certain things. It’s the higher ranges that I am referring to. This is really splitting hairs here, but I think the point I was trying to make was that, when you start delineating it with clear cutoffs, such as ‘You must have an IQ over 140 to be a brain surgeon’ that is where it can do some damage, because, when you start getting up into those upper ranges, a person with 135 might actually be smarter than someone who measured 145. Maybe s/he had a bad day when s/he took the test, or maybe some aspects of that intelligence weren’t measured accurately. A high school student might take those values literally, even if s/he missed it by a couple of points. So if such generalizations are given, they need to be qualified with emphasizing that they are estimated ranges and not to be taken literally.</p>
<p>Also, many gifted artists, musicians, and other creative thinkers might not score well at all on an IQ test, because it tends to favor left-brain capability so is therefore less accurate in measuring that which cannot be quantified: ie, creativity and thinking outside the box. IQ tests might be the most helpful when determining aptitude for the hard sciences, and less so for less tangible pursuits.</p>
<p>“Many people underperform their potential, as related to IQ. Fewer people overperform that potential.”</p>
<p>I agree with the former but not the latter. If someone overperformed what they thought was their potential, based on some test designed by humans, then obviously it was an inaccurate measurement of that potential. A potential can only be aspired to, never exceeded; else it is not potential!</p>
<p>As I said, I work for a testing company. Believe me, they make mistakes. I would encourage my kids to not take such measurements too seriously. Allow them to be an inspiration if they’re high, perhaps, but never allow them to be a limiting factor, at least not when the student displays the capabilities needed for his/her chosen pursuit. Interest and inspiration can be quite effective at stretching those brain cells! I don’t know too many people with low intelligence who have aspirations to be brain surgeons, anyway, so it sort of works itself out in the end. More damaging might be when parents push their kids too much, or don’t encourage their kids enough, based on some scores. I think it’s better for the kid if the parents allow their own interests and aspirations to lead the way, while providing gentle (and sometimes firm) nudging.</p>