Above all, however, the syntheses of the Psyche incarnate on their own account the three dimensions of these systems in general: psychic connection (Habitus) effects a coupling of series of excitations; Eros designates the specific state of internal resonance which results; and the death instinct amounts to the forced movement whose psychic amplitude exceeds that of the resonating series themselves (whence the difference in amplitude between the death instinct and the resonating Eros).