Interesting post at Cognitive Dailey regarding classic Shephard's 3D block rotation experiments, which clearly measure the CHC ability of Gv-Vz.
WJ III Diagnostic Supplement test users will notice the obvious similarity to the WJ III Block Rotation.
Technorati tags: CHC theory. psychology. intelligence. cognition. educational psychology. iq testing. psychological testing. intelligence theory. visual-spatial. Gv. Woodock Johnson. WJ III.