My DD just turned 8 and she hasn't taken the WISC, but I asked her to do digit span forwards and backwards. She can repeat about 5 numbers backwards but I'm pretty sure she is not doing it visually. When I do it myself I'm not doing it visually either. As she repeats backwards, she's remembering them forwards auditorially, and then reverses them
I tried writing numbers on a piece of paper and having her look for a few seconds, then taking it away, and she can't remember them that way as well as just saying them and then repeating them.
This is an interesting link on visual-spatial thinkers--maybe he will fit in one category or another and it will give you more insight. Or maybe it will just be more confusing. My DD is mostly on the right. She is pretty good with spelling and phonics though which is on the left.
http://www.gifteddevelopment.com/Visual_Spatial_Learner/vsl.htm
