Discovery stage: We analyzed the relationships between the cognitive/biological variables (fluid reasoning, crystallized ability, working memory capacity, attention control, cortical thickness, and cortical surface area) assessed at Time 1 and the behavioral outcome of interest at Time 1 (adaptive visuospatial n-back) for the ISG.
The cognitive variables were fluid reasoning (Gf), crystallized ability (Gc), working memory capacity (WMC), and attention control (ATT).
CA, crystallized ability
; FA, fluid abilities; HL, health literacy.
Furthermore, given the brevity of the test as compared to the lengthier KAIT, the Shipley may be indispensable to diagnosticians if its validity is established as a test of fluid and crystallized ability
. It is expected that the Shipley Verbal subtest will be more strongly associated with the KAIT Crystallized but not the KAIT Fluid Scores.
As expected, the elderly group's performance on the theory of mind stories was related to fluid ability and crystallized ability
. Unexpectedly, however, their performance on the physical stories also correlated with fluid ability.
They do interface very well, in many respects, but there's still one part of the CHC theory that is so fundamental to it, and that is Gc or crystallized ability
. The Gc construct was put aside in our original K-ABC theorizing, so we had two very different approaches to consider, both of which greatly influenced our thinking about intelligence.
It has its origin in Cattell's (1971) Gf-Gc theory which conceptualizes Gf (fluid ability) as the basic ability and Gc (crystallized ability
) as the development of this ability in a number of areas determined by motivation, education, interests and so on.