This thesis offers a posthumanist reading of Sigmund Freud's psychoanalytic theories on body-ego and its somatic relations to the environment in Das Ich und das Es (The Ego and the Id), Die Traumdeutung (The Interpretation of Dreams), and Das Unbehagen in der Kultur (Civilization and its Discontents). Agential Realism, a philosophy proposed by Karen Barad, builds on recent insights in quantum physics. Using Barad's theory, I read bodies as "intra-actively" entangled with matter and meaning, so

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... hat the body-ego as "phenomenon" materializes from a co-constitutive subject position within relationships with others. Unlike interaction, where pre-existing entities meet, "intra-action" emphasizes the mutual constitution of entangled agencies. This approach allows re-centering the body in ego formation and the subject-object relations in psychoanalysis. Following Barad's understanding that "knowing is a direct material engagement" (Meeting the Universe Halfway, 2007), this analysis offers novel paths to engage with Freud's creative somatic materializations in the body. Posthumanist feminist philosophies are uniquely situated to elucidate the intra-activity of the unconscious as enlivened and productive. This "biological phantasy" (Wilson, Gut Feminism 2015) as both somatic and imaginary, constitutes a collective event through which body-ego emerges. Just as "matter feels, converses, suffers, desires, yearns and remembers" (Barad), this material reworking provides a novel understanding of the creative relation of the Freudian body-ego with cultural phenomena and collective states. The proposed theory offers new perspectives on psychoanalysis through a new materialist lens when navigating the willful aberrations of bodily unruliness.