In the winter of 1913, Carl Jung sat at his desk in his house in Küsnacht, Switzerland, and did something that no respectable scientist was supposed to do. He began deliberately inducing visions — allowing himself to sink into a waking dream state and observing what emerged from the depths of his own mind, recording the images in meticulous detail in a leather-bound notebook that he called the Liber Novus, later published as the Red Book.
What he found there disturbed him deeply. Floods. Dead rising. A sea of blood covering Europe. This was late 1913, months before the First World War began. Jung initially feared he was losing his sanity. Later, he reframed the experience as the beginning of his most important scientific work: an investigation into the deepest layers of the human psyche, where imagery was not random but structured — organised around patterns he called archetypes that appeared, with remarkable consistency, in the myths, dreams, and visions of people across every culture and every century of recorded history.
For most of the twentieth century, this work occupied an uncomfortable territory between science and something harder to categorise. Freud dismissed him. Behaviourists ignored him. Neuroscientists had no tools to examine his claims. But in 2025, a landmark paper published in Neuroscience of Consciousness by a team including Robin Carhart-Harris — then of Imperial College London and subsequently at the University of California, San Francisco — proposed a formal neuroscientific framework for Jungian archetypes grounded in the Free Energy Principle and Predictive Processing theory. The paper’s argument: archetypes are not mystical relics but eigenmodes of deep brain activity — recurring patterns of neural organisation that shape imagination, myth, and the deepest structures of human meaning-making.
Jung was not a mystic. He was a scientist who was trying to study something for which science had no adequate tools in his lifetime. The tools are beginning to arrive.
From Freud’s Heir to Independent Scientist: The Break That Changed Psychology
Carl Gustav Jung was born on 26 July 1875 in Kesswil, a small village on Lake Constance in Switzerland. His father was a pastor in the Swiss Reformed Church, and his childhood was shaped by the tensions he observed between the official doctrines of religion and what seemed to him the far more complex, darker, and more interesting reality of human experience.
He became a psychiatrist almost by accident — when choosing between surgery and internal medicine for his medical training at the University of Basel, he picked up Krafft-Ebing’s textbook of psychiatry one evening and found, to his surprise, that it described exactly the territory he had always been most curious about: the intersection of the mind, the body, and the strange territory between sanity and its dissolution.
He joined the Burghölzli psychiatric clinic in Zurich in 1900, working under Eugen Bleuler — the psychiatrist who coined the term schizophrenia. There, he developed his word association test: a diagnostic technique in which a patient responds to stimulus words, and the pattern of their responses — their delays, their hesitations, their unexpected associations — reveals complexes in the unconscious that they would not acknowledge directly. This work was rigorous, measurable, and publishable. It was also what brought him to Freud’s attention.
The friendship and intellectual collaboration between Jung and Freud, which began in 1907 with a thirteen-hour conversation at Freud’s apartment in Vienna, was one of the most consequential — and most catastrophically failed — partnerships in the history of psychology. Freud saw Jung as his intellectual heir and designated successor. Jung saw Freud as the most penetrating psychologist he had ever encountered, but disagreed fundamentally with the primacy Freud placed on sexuality as the source of unconscious motivation, and grew increasingly uneasy with Freud’s insistence that the psychoanalytic theory was a finished system that should be defended rather than questioned.
The break came in 1912, when Jung published Wandlungen und Symbole der Libido — translated as Psychology of the Unconscious — in which he reinterpreted the concept of libido as general psychic energy rather than specifically sexual energy, and proposed that mythological imagery in his patients’ dreams reflected not personal repressed experience but something inherited: a deeper layer of the unconscious shared across the species. Freud regarded this as a betrayal. Their correspondence ended acrimoniously. Jung’s period of self-examination began — and with it, the work that would define the rest of his life.
The Architecture of the Psyche: What Jung Actually Proposed
Jung’s model of the psyche is more structured and more scientifically specific than its popular reputation suggests. Understanding it requires distinguishing the different layers he described and the evidence he adduced for each.
The outermost layer is consciousness — the aware, purposive mind that we ordinarily identify as ourselves. Jung described its centre as the ego: the complex of representations that constitute the sense of personal identity. The ego is not the whole psyche. It is, in Jung’s framework, a relatively small island in a much larger sea.
Beneath consciousness lies the personal unconscious — the repository of repressed experiences, forgotten memories, and emotionally charged complexes that are too disturbing or too insignificant to be maintained in conscious awareness. This is roughly the territory Freud described. For Jung it was real and important but it was not the most interesting level of the unconscious.
Beneath the personal unconscious lies what Jung called the collective unconscious — a deeper layer of mental structure that is not personally acquired but inherited: the product of millions of years of human evolution, encoded not in specific memories or specific experiences but in the patterns and tendencies of human mental life. The collective unconscious is not accessible to direct introspection in the ordinary sense. It manifests in dreams, in myths, in religious imagery, in the recurring narrative patterns that appear across cultures that had no contact with each other — the Hero, the Great Mother, the Trickster, the Shadow, the Wise Old Man. These recurring patterns Jung called archetypes.
Jung was careful to distinguish between the archetype as such — a formal tendency or predisposition in the psyche, essentially inaccessible to direct observation — and the archetypal image: the specific cultural or personal content through which the archetype manifests. The Hero archetype is universal. The specific hero — Gilgamesh, Odysseus, the Buddha, Luke Skywalker — is culturally specific. The pattern is inherited; the content is acquired. This distinction is important for evaluating the scientific status of his claims, because it makes them considerably more testable than a naive reading of the collective unconscious might suggest.
The most important of the archetypes for individual psychological development are the Shadow — the rejected, disowned aspects of the personality that are projected onto others; the Anima and Animus — the contrasexual aspects of the psyche, the feminine in men and the masculine in women; and the Self — the central archetype of order and wholeness in the psyche, the goal of what Jung called individuation: the lifelong process of integrating unconscious material into consciousness to achieve a more complete and authentic personality.
What the Neuroscience Now Says: Archetypes as Neural Eigenmodes
The 2025 paper by McGovern, Aqil, Atasoy, and Carhart-Harris, published in Neuroscience of Consciousness (Oxford University Press), represents the most rigorous attempt yet to translate Jungian theory into a neuroscientific framework. Its central proposal is that archetypes can be understood as eigenmodes of the deep brain — recurring patterns of neural activity that arise from the intrinsic architecture of the brain’s connectivity rather than from specific experiences or cultural inputs.
The theoretical framework it uses is the Free Energy Principle, developed by Karl Friston at University College London, and Predictive Processing theory — the model of the brain as a prediction machine that constantly generates hypotheses about the causes of sensory input and updates them in response to prediction errors. In this framework, the brain is not a passive receiver of sensory information but an active modeller of the world, generating expectations and revising them continuously.
The authors propose a trilogical interplay between three neural domains in the generation of archetypal experience: the high-level cortex, which generates abstract narrative and symbolic content; the low-level sensory cortex, which provides perceptual imagery; and subcortical affective systems, which provide the emotional charge that makes archetypal imagery feel numinous — charged with significance beyond its surface content. When these three systems interact in altered states — deep meditation, psychedelic experience, fever dreams, certain near-death states — they produce experiences that match the phenomenological descriptions of archetypal encounter that Jung collected from patients and from cross-cultural mythology.
The paper also addresses the transmission of archetypes between individuals, proposing that shared archetypal patterns emerge from the combination of shared evolved neural architecture and shared developmental environments — both biological inheritance and cultural inheritance operating simultaneously. The collective unconscious, in this framework, is not a mystical shared mind but a consequence of the fact that all human brains are built to the same evolutionary specification and develop in broadly similar environments.
This is not the same as proving Jung was right in every detail. It is a demonstration that his core intuitions — that the unconscious has structure, that that structure is partly inherited, and that it manifests in recognisable patterns across cultures — are consistent with contemporary neuroscience and have a plausible mechanistic basis. As Robin Carhart-Harris noted in discussing the research: “By proposing that archetypes correspond to neural eigenmodes, we are suggesting that what Jung called the collective unconscious may be better understood as the collective architecture of the human brain.”
Separately, a 2025 review in the International Journal of Jungian Studies, examining Gary Clark’s book Carl Jung and the Evolutionary Sciences (Routledge, 2025), noted the convergence between Jungian analytical psychology and contemporary evolutionary biology and neuroscience, arguing that archetypes can be understood as genetically encoded predispositions — analogous to the innate releasing mechanisms described by ethologist Konrad Lorenz — that have been shaped by natural selection because they confer adaptive advantages in social coordination, threat detection, and meaning-making. Stevens and Vedor, writing in 2023, proposed that universal archetypal patterns emerge from evolved brain structures and genetic predispositions, aligning Jungian theory with the evolutionary psychology of Stephen Pinker, David Buss, and others at the interface of psychology and evolutionary biology.
Synchronicity: The Most Controversial and Most Interesting Proposal
Of all Jung’s contributions, the concept of synchronicity is simultaneously the most contested and the most intellectually interesting from a physics perspective. Jung defined synchronicity as “an acausal connecting principle” — the meaningful coincidence of an inner psychic event and an outer physical event that are not causally related but whose connection cannot be dismissed as mere chance.
His most famous example came from his clinical practice. A patient was describing a dream in which she had been given a golden scarab — a symbol of rebirth in ancient Egyptian mythology — when Jung heard a tapping at his consulting room window. He opened it and found a rose chafer beetle, the closest equivalent of a scarab found in central Europe, which had apparently flown toward the light of the room. He handed it to the patient and said: “Here is your scarab.” The patient’s rigidly rationalistic defences broke down, and the therapy moved forward. Whether this was a meaningful coincidence or a genuinely acausal connection between psyche and world, Jung could not determine.
What is scientifically interesting is that Jung developed the concept of synchronicity in extended dialogue with Wolfgang Pauli — the Nobel Prize-winning physicist who formulated the exclusion principle that bears his name and who was simultaneously one of the creators of quantum mechanics. Pauli was in analysis with Jung for many years, and their correspondence — published as The Interpretation of Nature and the Psyche in 1952 — represents one of the most unusual intellectual collaborations in the history of science: a psychiatrist and a quantum physicist jointly attempting to understand whether the non-causal connections implied by quantum mechanics (specifically the correlations between entangled particles that Einstein called “spooky action at a distance”) might have a psychological analogue.
Neither Pauli nor Jung claimed to have solved the problem. What they did was identify a genuine conceptual gap in the scientific worldview of their time: the assumption that all meaningful connections must be causal, and that anything not causal must be random. Quantum mechanics had already demonstrated, by the 1950s, that this assumption was incorrect at the physical level. Whether it had implications at the psychological level remained, and remains, an open question. For the full story of quantum entanglement and what it actually implies about the nature of physical reality, see our article on quantum entanglement: the mystery at the heart of quantum mechanics.
What Scientists Say
“By proposing that archetypes correspond to neural eigenmodes, we are suggesting that what Jung called the collective unconscious may be better understood as the collective architecture of the human brain.”
— Robin Carhart-Harris, Professor of Neurology and Psychiatry, University of California San Francisco; formerly Head of Psychedelic Research, Imperial College London. Co-author, Neuroscience of Consciousness (Oxford University Press, 2025)
“Jung’s hypothesis of a genetically inherited collective unconscious is entirely consistent with contemporary evolutionary biology and can be reformulated in terms of evolved psychological mechanisms — innate predispositions that have been shaped by natural selection.”
— Anthony Stevens, psychiatrist and author of Archetype: A Natural History of the Self (Routledge, 2002), drawing on the convergence of Jungian psychology and evolutionary biology
“Jung is the one thinker who consistently refused to separate what we know from what we are — who insisted that the knower cannot be subtracted from the knowledge.”
— James Hollis, Jungian analyst and author, Executive Director Emeritus, Jung Society of Washington
“I have had to acknowledge that the unconscious creates symbols which it is not possible to distinguish from religious ideas.”
— Carl Gustav Jung, Memories, Dreams, Reflections (1962), on the discovery that the unconscious produces imagery with a numinous, irreducibly meaningful character that resisted purely clinical interpretation
Jung’s Scientific Legacy: What Has Lasted and What Has Not
Evaluating Jung’s scientific legacy requires distinguishing between claims that have proved robust and claims that have not.
What has proved robust: the clinical reality of complexes — emotionally charged unconscious configurations that organise experience and behaviour in ways that resist direct conscious control — is well established in contemporary psychotherapy. The Myers-Briggs Type Indicator, derived from Jung’s typology of introversion, extraversion, thinking, feeling, sensing, and intuiting, has been used by millions of people and remains one of the most widely employed personality assessment tools in the world, despite significant psychometric limitations. The broader concept that personality has consistent structural dimensions has been confirmed by the Big Five personality model, whose dimensions of Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism overlap significantly with Jungian types.
The concept of psychological projection — attributing to others qualities one does not acknowledge in oneself — is a robust clinical and social psychological observation that has been extensively confirmed experimentally, even when the Freudian or Jungian theoretical framework around it is contested.
The universality of certain mythological motifs across cultures — documented by anthropologists and comparative mythologists from Frazer and Lévi-Strauss to Joseph Campbell — is not seriously disputed, even if the explanation for this universality (inherited neural architecture versus cultural diffusion versus convergent invention) remains open.
What has not held up as well: the specific archetypal figures Jung described — the Anima and Animus, the Shadow, the Wise Old Man — while clinically useful as descriptive categories, have not been validated as discrete, universal structures in the way Jung envisaged. His more speculative later work on synchronicity, alchemy, and the collective dimensions of consciousness moved progressively further from testable claims. And his claim that the collective unconscious is inherited in the strong sense — that specific symbolic content is genetically encoded — faces the same problems as any claim about the inheritance of specific complex mental contents, which evolutionary biology finds implausible.
The honest assessment: Jung proposed a research programme more than a finished theory. He identified real phenomena — the universality of certain deep psychological patterns, the structured nature of the unconscious, the insufficiency of a purely personal account of the psyche — that contemporary neuroscience is beginning to investigate with tools he did not have. Whether his specific theoretical framework will survive that investigation largely intact, or whether the phenomena he identified will be explained in terms he would not have recognised, remains to be seen.
Why This Matters: Jung, Consciousness, and the Science of the Mind
The question of why Jung still matters in 2026 is not primarily a question about whether his specific theories are correct. It is a question about what kind of science psychology should be, and what phenomena it should take seriously.
The dominant paradigm in academic psychology for much of the late twentieth century — behaviourism, then cognitive science, then neuroscience — has been extraordinarily productive in certain domains. The neural correlates of perception, attention, memory, and decision-making are much better understood than they were fifty years ago. But these approaches have been less successful at engaging with the phenomena that occupied Jung most centrally: the meaning of dreams, the experience of the numinous, the patterns that repeat across the lifespan and across cultures in the imagery of the imagination, the sense that there is more in the unconscious than personal biography.
The recent convergence of psychedelic neuroscience — the revival of research into psilocybin, LSD, and DMT as probes of the deep mind, at institutions including Imperial College London, Johns Hopkins Medicine, and NYU Langone Health — with Jungian theory is not accidental. Psychedelic states reliably produce the kinds of experience that Jung described: encounters with archetypal figures, dissolution of ego boundaries, access to imagery that feels ancestral or transpersonal, experiences of synchronicity and profound meaning. The neuroscience of these states is generating frameworks — Predictive Processing, the Default Mode Network, entropic brain theory — that may provide the mechanistic vocabulary for what Jung was trying to describe in the language available to him in the early twentieth century.
Jung’s insistence that the scientist cannot be subtracted from the science — that the psychologist who studies the mind is also, inescapably, a mind studying itself — has proved more relevant rather than less as psychology has matured. The hard problem of consciousness, which asks why there is subjective experience at all, is in part a Jungian problem: it is the question of what the inner life actually is, and why its character is so different from the third-person descriptions that science produces. For the full story of the hard problem and where neuroscience stands on it, see our article on the hard problem of consciousness: why science still cannot explain why you are aware.
Jung spent his life on this problem. He did not solve it. But he described it with more precision and more honesty than almost anyone before or since. That is worth something — and it is why, more than sixty years after his death, the scientific conversation around his ideas is growing rather than fading.
Frequently Asked Questions
Who was Carl Jung and what did he discover?
Carl Gustav Jung (1875–1961) was a Swiss psychiatrist and founder of analytical psychology. His major contributions include the concepts of the collective unconscious, archetypes, the psychological complex, introversion and extraversion, individuation, and synchronicity. He is one of the most influential thinkers in the history of psychology, and his work is currently being re-examined through the lens of neuroscience, evolutionary biology, and psychedelic research.
What is the collective unconscious?
The collective unconscious is Jung’s term for the deepest layer of the unconscious mind — a level that is not personally acquired through individual experience but inherited from the evolutionary history of the species. It is structured by archetypes: recurring patterns of imagery and behaviour that appear across cultures without direct cultural contact. A 2025 paper in Neuroscience of Consciousness proposed that the collective unconscious can be understood neuroscientifically as the shared architecture of the human brain — evolved neural patterns that predispose us to certain forms of imagery and meaning-making.
What are archetypes and are they real?
Archetypes are universal patterns in the human psyche — the Hero, the Shadow, the Great Mother, the Wise Old Man — that appear consistently in myths, dreams, and religious imagery across cultures. Jung distinguished between the archetype as a formal tendency or predisposition and the archetypal image through which it manifests culturally. Contemporary neuroscience and evolutionary psychology support the existence of inherited neural predispositions that could explain the universality of archetypal patterns, though the specific Jungian framework is still debated.
Why did Jung and Freud split?
Jung and Freud split primarily over two issues. First, Jung rejected Freud’s insistence that sexuality was the primary driver of unconscious motivation, proposing instead that libido was general psychic energy that could be directed into many different forms of activity. Second, Jung proposed the collective unconscious — a layer of the psyche deeper than the personal unconscious that Freud had described, inherited rather than acquired, and structured by universal patterns he called archetypes. Freud regarded both proposals as apostasy from the psychoanalytic theory he had established.
What is synchronicity?
Synchronicity is Jung’s term for meaningful coincidence — the occurrence of an inner psychic event and an outer physical event that are connected by meaning rather than by cause and effect. Jung developed this concept in collaboration with the physicist Wolfgang Pauli, who won the Nobel Prize for the exclusion principle in quantum mechanics. The concept remains scientifically controversial but continues to attract interest from physicists and consciousness researchers exploring the relationship between mind and physical reality.
Is Jungian psychology accepted by mainstream science?
Parts of Jung’s work have been well received. The concepts of introversion and extraversion, psychological complexes, and the general structure of his typology have been incorporated into mainstream personality psychology. The collective unconscious and archetypes have been more controversial, but a 2025 paper in Neuroscience of Consciousness proposed a formal neuroscientific framework for archetypal theory grounded in Predictive Processing and the Free Energy Principle, marking a significant shift toward mainstream scientific engagement with Jungian ideas.
Sources
- McGovern, Aqil, Atasoy & Carhart-Harris — “Eigenmodes of the Deep Unconscious: The Neuropsychology of Jungian Archetypes and Psychedelic Experience,” Neuroscience of Consciousness, Oxford University Press (2025)
- Clark, G. — “Carl Jung and the Psychedelic Brain,” International Journal of Jungian Studies, Brill (2021)
- Review of Gary Clark, Carl Jung and the Evolutionary Sciences, Routledge (2025) — International Journal of Jungian Studies, Vol. 17, Issue 2
- Wikipedia — Jungian Neuroscience
- Wikipedia — Collective Unconscious
- Wikipedia — Carl Jung
- Wikipedia — Synchronicity
- Meridian University — Jungian Archetypes and the Hidden Architecture of the Psyche
- MacTutor — Carl Jung Biography (University of St Andrews)
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