Do you see perfectionist qualities? Sometimes the lower processing speed can also be due to that. So, I guess what I am saying in a round about way that that lower PSI could be due to a combination of factors....his sensory issues, as well as gifted perfectionist qualities.
This is just a guess - so take it fwiw, I'm not a professional, but I have a child with a large discrepancy in PSI vs other WISC scores. I'm guessing that perfectionism is not the reason for the lower PSI scores, because you see the dip in subtest scores consistently across the three PSI subtests and also - more importantly - you see it consistently in the timed achievement tests (the tests labelled "fluency"). I think if the issue was perfectionism you would see more scatter in these subtests, rather than consistently lower scores.
I have more to say, but want to quote, so I'll be back with another reply!
polarbear
