I read a book by this author and found this page interesting as a condensed version. Do your kids fit neatly in one column or the other? Both of mine seem to be on the right, but both are also extremely good with phonics and decoding, which seems to be more of a left-column thing.
http://www.gifteddevelopment.com/Visual_Spatial_Learner/vsl.htm

I have never had testing done with DD (other than the awful CogAT which is invalid since she didn't answer half the questions on the non-verbal sections), but DS scored 27 points higher in non-verbal IQ than verbal. He also scored 99+ percentile on a visual perception test. He memorizes maps and obviously sees shapes and patterns in everything.