When bodies invade - Merleau-Ponty and psychoanalysis

Why a dialogue between Maurice Merleau-Ponty's intellectual experience and psychoanalysis? Perhaps it would be more prudent to begin with another question: why does Merleau-Ponty have recourse to what he calls non-philosophies? Any reader of the philosopher's work can continually ask why the sciences, politics, institutions and the arts in general are so present in his thinking. Why is this dialogue so constant and so constitutive of his philosophical experience? And why, among the various non-philosophies to which the philosopher had recourse, was his dialogue with psychoanalysis chosen?