Can we model organismic causes of working memory, efficiency and fluid intelligence? A meta-subjective perspective

I critically examine the target paper by Demetriou et al. (2013) noticing that their epistemological perspective is meta-empiricist (i.e., taking the viewpoint of an external observer). This viewpoint is contrasted with to a metasubjective perspective (i.e., that of the subject-matter itself - organismic processes). I explain working memory (whose key developmental determinant is mental - M - attention), as well as processing speed, and Gf from a metasubjective perspective; and I emphasize that difficulty of an item/task is relative to the trade-off level between its item/task mental-attentional demand and the participant's mental-attentional capacity. I list principles of measurement for proper assessment of mental/executive/endogenous attention (M-capacity) and explain some of the results of Demetriou et al. as resulting from inadequate control of this M-demand/M-capacity trade off in their tasks. Demetriou et al. have achieved clear demonstration that WM, Gf, and processing speed are distinct latent variables whose inter-relations change with age. To clarify further their organismic causal determinants they should make a “metasubjective turn” in their theorizing.