**1. Introduction**

As part of a process of epistemic expansion in psychoanalysis, besides a long-standing relationship with philosophy, many authors have created dialogs with other disciplines, over the past decades. The humanities, attachment, developmental studies, and ethnic and gender identity studies are only few fields that are currently contributing to the creation of diversity in our field. As a discipline, neuropsychoanalysis has been officially founded in 2000, but it has reflected the rapid development of neuroscientific research and the need for a dialog between brain sciences and psychoanalysis. In fact, such a dialog can be traced back to Freud's "Project" and "On Aphasia." In this chapter, I will be covering the "interface," the intersection and interaction at the border of a variety of concepts in psychoanalysis. I will begin with some of the previously presented ideas on free association (FA), as an enduring basic concept, the ground rule (i.e., *Grundregel*), and its relationship to thought deconstruction, reconstruction, and therapeutic change

in psychoanalysis. I will then propose that the primal repressed (PR) and synchrony be considered as subjects of our future exploration, from a neuropsychoanalytic point of view.
