As the article explains (in section "Cognitive style" and Figure 2) cognitive style depends on the computational properties of the brain, and these are the consequence of their network architecture and synaptic activity, all of them having its origin in genetic and epigenetic causes. What is more important is that there isn't one genetic or epigenetic cause, but certain combinations that produce the hypoentropic dynamism. To explain it: what causes a good soccer player? There is no a unique cause, but a combination of them, some genetic, some not.