Interesting article. I don't think the WISC tests for visual spatial memory that well. The closest test might be block design. The digit span and letter-number sequence requires remembering digits/letters numbers said orally (strangely DS did much better on letter/number sequence than on digit span).
DS did take a Test of Visual Perceptual Skills because he had a brain injury and his eyes were looking in different directions. He hit the ceiling on the subtests for visual memory and visual spatial ability. So his visual memory appears to be a lot better than auditory.
