Abstract

This dissertation reconceptualizes psychopathology through a synthesis of Heidegger’s existential analytic and contemporary enactivist cognitive science. It argues that dominant models in psychiatry, particularly biomedical and representationalist frameworks, remain constrained by Cartesian assumptions and fail to account for the embodied, relational, and world-disclosing nature of mental illness. Drawing on Heidegger’s distinction between ready-to-hand and present-at-hand, this work reinterprets breakdowns in practical coping not as internal dysfunctions but as disruptions in the existential structure of being-in-the-world. The lived body, rather than being a mechanistic substrate, is revealed through its participatory role in world constitution. When illness emerges, it signals not a failure of bodily function but a collapse in the integration of self, body, and world. Using comparative phenomenological analysis, the dissertation integrates concepts from ecological and developmental psychology, pragmatism, phenomenology, and enactivist theory, particularly autopoiesis and participatory sense-making, to explore how Dasein’s identity is enacted through embodied interaction and relational responsiveness. It develops a non-dualistic account of selfhood in which psychopathology is understood as a failure of adaptive equilibration rather than as a deviation from normativity. Mental illness is thus reframed as a transformation in the structure of affordances and world-relation; it often reveals the fragile, recursive nature of identity and its dependence on meaningful engagement. Central to this project is a reinterpretation of Heidegger’s concept of authenticity. Rather than being a normative ideal, authenticity is presented as an existential dynamic; a mode of regaining coherence through the confrontation with fragility, fallenness, and temporal rupture. Authenticity allows for reintegration into everyday life not by transcending inauthenticity but by making it visible as a necessary horizon for sense-making. Drawing on both phenomenological and enactivist perspectives, the work shows how Dasein’s existential freedom is situated, embodied, and contingent upon its capacity to maintain ontological flexibility in the face of crisis. The thesis concludes by arguing for a therapeutic model rooted in the restoration of existential orientation rather than the elimination of symptoms. Health is reframed as the capacity for world re-engagement, not as equilibrium or normality. Illness discloses the limits and possibilities of sense-making; it exposes the constitutive role of fragility in selfhood. This approach calls for a hermeneutic and relational understanding of psychopathology, attentive to the embodied structures of mood, care, and temporality. By bridging Heidegger’s ontology with enactivist models of cognition, the dissertation offers a conceptual foundation for a phenomenologically grounded, ethically responsive, and clinically relevant account of mental illness. In doing so, it contributes to ongoing debates in philosophy of psychiatry and cognitive science while challenging reductive assumptions that obscure the lived meaning of suffering.