“…In those papers we confronted the hard problem, that is, the problem of "integrating consciousness, per se, into our conception of nature" [3][4][5][6][7][8][9][10][11]. Following John Searle idea [4,7], we introduced a mathematical formalism that demonstrates how ordinary measurements and the freedom to select a measuring device type, are integrated into a single mathematical framework through the introduction of the concept levels of a hierarchy [1,2]. For that purpose we extended the Hilbert space into a Hilbert hyperspace, that is, a new space containing the levels of a hierarchy.…”