Unfortunately this analysis is based on the WISC-III and not the more recent WISC-IV. Nevertheless, the results still provide useful information on the WISC-III tests that are still present in the WISC-IV.
Given all I've written regarding the various MDS models, I'm going to only make a few comments and hope others take the presentation of these data to engage in additional discussion, interpretion, etc.----have some fun.
A few observations/comments:
- Gv tests (both WISC-III and WJ III) continue to surface on the more outer rings of the MDS models---suggesting that they are more lower-level perceptual/processing measures and do not capture complex Gv cognitive processing. See my Gv comments on this the other day. The same can be said for Ga tests.
- WJ III Understanding Directions is consistently one of the more cognitive complex tests. And, it is largely a language-based measure of working memory (Gsm-MW). Remember that as per the Radex model, cognitive complexity deals with the amount of elements/components that are processed.....and is not the same as abstract thinking (Gf-ish stuff). WJ III Numbers Reversed also shows up close to the center, with WISC-III Digit Span not far behind. Does this support the popular working memory=Gf/g research hypothesis?
- The Gc tests from both batteries appear similar in placement.
- As would be expected, the WJ III Gf tests (Concept Formation, Numerical Reasoning [which is a combo of Number Series and Number Matrices], and Analysis-Synthesis are within the center "cognitive complexity" circle.
A couple caveats I provided the other day are also relevant here--(a) I'm a coauthor of the WJ III (conflict of interest disclosure) and (b) these results have not been peer-reviewed