I am still reading through and digesting my DDs evaluation but as you know her scores were very similar to your DS's.
My understanding was that even though the PSI and WMI are in the average range, the fact that the spread is so large (>30 points) means that there is a big bottleneck causing major frustration.
I imagine it sort of like trying to use sophisticated new software on an old PC with insufficient RAM - it just doesn't work well. I could be wrong in my understanding but that's what I got from it.
My DD tested for 6 hours on one day and they administered the WAIS-IV, selected sub-tests of the WJ-III Cognitive, the WAIT-III, Nelson-Denny Reading, Learning Disabilities Evaluation Scale, Behaviour Rating Scale of Executive Functioning, Gilliam Asperger's Dissorder Scale, Auchenbach Child Behavior checklist and the Student Styles Questionnaire.
She was diagnosed with ADHD inattentive and recommended for the trial use of medication. She asked if re-taking the WAIS while medicated would change her scores and she was told it probably would, but that she could not re-take the test for 3 years since the results would be compromised due to familiarity if re-taken within 3 years.
