Many competences such as biology, sociology, geography, politics, history, linguistics, anthropology, etc. challenge each other around the problem of borders. Leaving aside so much complexity, the author’s intent is to tackle the issue in the specifi-cally psychoanalytic field by exploring the boundary of self as it becomes configured in the process of normal and pathological development, within the dual dimension - interpersonal (the establishment of an encounter between self and the other) and intrapsychic - as a progres-sive organization and differentiation of areas and structural levels. When investigating the early roots of deficits and suffering, flaws are inevitably found in the separation-individuation process that underlies the constitution of the sense of borders. In the second part of the paper, the case of a bulimic patient suffering from agoraphobic crises is illustrated inasmuch as - in the opinion of the author - this problem is particularly evident in the psychopathological configuration of agoraphobia.
Keywords: Phobia, agoraphobia, shield against stimuli, defense mechanisms, separation-individuation.