It can not be said, strictly speaking, that the prolonged session (sp) described in this book is a mere extension of the common fifty-minute psychoanalytic session. Although the different auxiliary techniques that are used in this type of prolonged session do not fulfill a therapeutic role per se, their use in a different time-space setting - retrogressive, very linked to the body, to the most basic structures and histories - constitutes a organism qualitatively differentiated from the common session, organism in which it remains as the only shared fundamental feature that in both types of sessions everything is finally resolved by means of the same therapeutic instrument, the transferential interpretation.