FIGURE 2.

Genuinely functional activity results from a complex relation between the structure ${\mathcal{S}}_{\mathrm{\Phi }}$ of the neurophysiological space Φ and the structure ${\mathcal{S}}_{\mathrm{\Psi }}$ of the abstract space Ψ of cognitive functions made observable by performance measures Γ (see text above). Thus subdivisions in one space are used to define subdivisions in the other