Depersonalisation is typically described as a distressing experience of detachment from self and world, characterised by feelings of disembodiment, emotional neutrality, and alienation, as if one were an external observer of one’s own mental and bodily processes. However, empirical research consistently highlights experiential dimensions systematically neglected by contemporary clinical and theoretical frameworks. These overlooked dimensions encompass heightened interconnectedness, blurred self-other boundaries, expanded spatiality and timelessness, intensified empathic resonance, and episodes of self-transcendence.

To address this critical explanatory gap, I propose a novel philosophical account integrating Eugene Gendlin’s phenomenology of radical embodiment and situatedness with Karl Jaspers’s existential ontology of boundary situations and authentic selfhood (Existenz). Current theories within 4E cognition, despite surpassing earlier cognitivist and individualistic approaches, implicitly retain an ontological dualism separating organism and environment. By contrast, Gendlin reconceptualises body-environment interaction as fundamentally nondual—an indivisible dynamic process from which experiences of self, environment, space, and time emerge as secondary derivative phenomena. Similarly, Jaspers’s notion of Existenz dissolves the subject-object dichotomy, identifying authentic self as emerging within existential boundary situations (Grenzsituationen)—limit-experiences such as suffering, anxiety, struggle, loss, and death, which compel us to confront the intrinsic contingency of our self-conceptions and empirical existence.

My central thesis is that depersonalisation represents such a boundary situation. Negatively, it manifests as pathological alienation resulting from the breakdown of dualistic psychological structures of selfhood. Positively, however, it can actualise radical existential openness and the genuine possibility for self-transformation and transcendence. The proposed account provides theoretical insights and therapeutic implications absent from prevailing paradigms, thus advancing our philosophical and clinical understanding of depersonalisation.

Keywords: Depersonalisation, Existential Phenomenology, Radical Embodiment, Boundary Situations, Authentic Selfhood, Self-Transcendence