My child got a 1% (62) on the Working Memory Index of WISC-IV. She got got a 99.5% (139) on PRI. That pretty much spans the whole scale. She has an executive function disorder. It is not ADD with inattentiveness although it presents that way to some degree. Her language organization is extremely poor and she has word retrieval issues.

http://speech-language-pathology-audiology.advanceweb.com/Article/Executive-Dysfunction.aspx

One thing that did come up in the testing is that my daughter performs better on the higher order memory tests than on the lower order tests (simple recall). The more difficult the task, the more she seems to concentrate and pay attention. The little things in life go right by her as if they aren't even there, but something interesting -- snags her and she pays more attention and carries through more frequently. I would suspect this is the case with most very bright kids.