Forgot to add, In terms of processing speed, my kids also have huge gaps. My daughter's perceptual reasoning score (on the WISC IV) was around 147 and her processing speed was something like 91. She has ADHD and the processing speed issue is clearly evident when she is doing math and is very slow with recalling math facts.
DS also had a big gap, but I think his is more related to his poor motor skills and not being able to do the motor tasks of the test, for example at least one subtest involved writing with a pencil.
