In the history of modern psychology, Freud appears as a thinker who stands at the point of rupture between philosophy and Kantian science, a point at which the Cartesian conscious subject could no longer be the bearer of the whole truth. This article argues that Freud’s turn from consciousness to the unconscious, rather than being a mere shift of focus from the conscious to the unconscious, is a response to the internal crisis of a psychology of consciousness and to the critique of the doctrine that identifies consciousness with the mental. This turn is deeply intertwined with Freud’s engagement with the German tradition (from Leibniz to Nietzsche) and with the physiological concepts of the Helmholtzian school.
Using a historical-philosophical method and drawing on Freud’s primary texts and related sources, the paper shows that the Freudian unconscious is neither a return to a metaphysical “soul” nor a reduction of the psyche to biological mechanisms but is instead conceived through the gaps and dysfunctions of consciousness, thereby transforming the very object of psychological science. It concludes that Freudian psychoanalysis should be understood as a radical alternative to a psychology of consciousness—one that is situated between philosophy and physiology, grounded in clinical experience and the analysis of the failures of consciousness, and that thereby makes possible a science of the unconscious.
Keywords: Freud, psychoanalysis, unconscious, science of psychology
Introduction
In the second half of the nineteenth century, psychology tried to become an empirical science rather than a subsidiary of philosophy. A dominant strategy was to install consciousness as the discipline’s proper object, because only what reaches awareness seemed observable and therefore testable. Yet this move generated an internal crisis: consciousness is also the condition of possibility of experience, so it resists being treated as a straightforward empirical object. Psychology was therefore suspended between scientific empiricism and philosophical reflection, and between the demand for observation and the problem of self-observation.
Freud emerges within this tension. He shares the ambition for a science of the psyche, but he denies that consciousness can exhaust psychic reality. He introduces the unconscious as a domain that is constitutively opaque, and he insists that it can nevertheless become an object of inquiry. The article argues that this turn is not a mere continuation of earlier philosophical talk about the unconscious. It is a response to the crisis of consciousness-centered psychology and a critique of the identity thesis that equates the psychic with the conscious. The central claim is that Freud’s turn becomes possible through a non-reductionist appropriation of nineteenth-century physiological concepts, and that it culminates in an alternative conception of psychological science grounded in clinical experience and interpretation.
Materials & Methods
The study uses an analytic-historical method with a genealogical orientation. Its materials are historical and conceptual texts: Freud’s major writings on theory and method, nineteenth-century debates about psychology’s object, and philosophical and scientific sources that situate Freud between modern epistemology and contemporary physiology. The analysis reconstructs a trajectory in which psychology moves from a metaphysical “soul” to “consciousness” as its scientific object, and then encounters a conceptual impasse. Freud’s key concepts, including the unconscious, psychic energy, and the pleasure principle, are interpreted in relation to the institutional setting of late nineteenth-century medicine and psychology and to the epistemic demand, associated with Kantian and Newtonian models, that genuine science be measurable, experimentally testable, and ideally mathematized.
Discussion & Result
First, the article distinguishes Freud’s unconscious from earlier invocations of what lies beyond awareness. Freud does not present a laboratory discovery secured by controlled experiment. He proposes an inference driven by clinical and conceptual pressure: conscious life exhibits gaps, distortions, and breakdowns, and these demand an account of processes that do not enter consciousness. Earlier modern thought had opened space for such determinants, especially once Cartesian criteria of clarity and distinctness excluded large domains of ordinary psychic life from the sphere of “truth.” Freud’s novelty lies in recasting these determinants as objects of a disciplined inquiry that aims at scientific description rather than metaphysical speculation.
Second, the article reconstructs the nineteenth-century crisis of psychology’s object. The movement toward “psychology without soul” sought to eliminate the metaphysical hypothesis of a persisting substance behind experience. Yet in replacing soul with “the mental,” many accounts remained within a Cartesian horizon that identified the mental with inner awareness. This replacement intensified the problem of objectivity: if consciousness is the object, psychology must observe what is simultaneously the subject of experience and the object to be captured in experience. The Freudian turn is presented as a rupture rather than a supplement. The unconscious is not introduced to complete consciousness, but to show why consciousness cannot serve as the sole foundation of psychological science.
Third, the article analyzes Freud’s methodological “middle position” between philosophy and physiology. Freud’s scientific ambition is anchored in his medical and neurological training, and he borrows from energetic and physiological vocabularies associated with Helmholtz and with Fechner’s principle of constancy. Concepts such as excitation, constancy, and psychic energy let him describe lawful processes that are not directly observable. At the same time, Freud departs from strict reductionism and from a purely laboratory model. His early attempt to translate psychology into neurophysiology in the 1895 Project is read as evidence of this ambivalence, as is his later abandonment of strict neural mapping while retaining energetic language as a theoretical heuristic. Freud’s science is thus portrayed as neither metaphysics in disguise nor physiology extended to the psyche, but an intermediate project that uses physiological concepts without reducing psychic phenomena to the brain.
Fourth, the article redefines what counts as experience in a science of the psyche. Freud’s evidence is not primarily conscious self-report under controlled experimental conditions. It is clinical experience: symptoms, dreams, slips, and bodily failures that appear as breakdowns of conscious mastery. These formations are treated as data with both causal and interpretive dimensions, and inquiry proceeds by reconstructing the logic of such failures in the analytic setting. The unconscious is therefore not a missing piece that completes a transparent picture of the psyche. It marks the limit of objectification and makes failure, symptom, and conflict central to scientific description.
Finally, the article interprets Freud’s claim to scientificity as a deliberate risk. Psychoanalysis, like the natural sciences, operates with theoretical primitives that are not directly observable and that remain initially indeterminate. Freud compares notions such as drive and psychic energy to physics’ use of concepts like force or gravity: their legitimacy lies in explanatory work and in revisability in light of further experience. On this reading, Freud proposes that psychology can be scientific without copying a strictly mathematized, laboratory template.
Conclusion
Freud is presented as a thinker working on a fault line between Kantian conceptions of science and older metaphysics. Nineteenth-century psychology sought legitimacy by abandoning the soul and enthroning consciousness, but this move produced a conceptual dead end. Freud’s response was to introduce the unconscious as an object that both explains the failures of consciousness and limits the project of making the psyche fully transparent. Psychoanalysis, as reconstructed here, retains a commitment to systematic explanation, but it replaces experimental testability with a disciplined use of clinical experience and interpretive reconstruction. The Freudian turn, on this account, redefines both the object of psychology and the meaning of scientificity in the human sciences.