Physical basis of archetypes

The question of where archetypes live in the body — whether they have a biological substrate at all, and if so what kind — has occupied Jungian thought from the beginning and has become one of the most productive sites of dialogue between depth psychology and contemporary neuroscience.

Jung himself was careful to distinguish two registers of the question. The archetype-as-such — what he called the facultas praeformandi, the preforming possibility — has no material existence of its own. His crystallographic analogy makes this precise:

The archetype in itself is empty and purely formal, nothing but a facultas praeformandi, a possibility of representation which is given a priori. The representations themselves are not inherited, only the forms, and in that respect they correspond in every way to the instincts, which are also determined in form only.

The axial system of a crystal preforms the structure of whatever precipitates from the mother liquid without itself appearing as a crystal. What is inherited is form, never content. This distinction — between the irrepresentable archetype-as-such and the archetypal image that becomes visible in consciousness — is the single most persistent clarification in Jung's writing on the subject, and it matters enormously for the biological question: you cannot locate the archetype-as-such in a brain region because it is not itself a psychic content. What you can locate are its effects, its precipitates, the images and affective states it generates.

Jung's own conjecture about those effects pointed subcortically. He wrote that the organizing system of the brain "must lie subcortically on the brain stem," reasoning from the affective and uniting properties of the Self archetype — properties that are "predominantly affective" — to a physiological basis in structures whose primary function is affective integration (Jung, cited in McGovern et al., 2025). Contemporary affective neuroscience has moved in exactly this direction. McGovern, Aqil, Atasoy, and Carhart-Harris (2025) propose a trilogical architecture: subcortical and limbic structures supply the affective core — the archetype-as-such in its nearest biological approximation — which then projects predictions upward into low-level cortex where archetypal imagery takes sensory form, and finally into high-level cortical regions where archetypal stories acquire narrative structure. The default mode network, densely connected to the prefrontal cortex and implicated in self-referential processing and social narrative, appears to be the site where archetypal themes become culturally transmissible stories.

Samuels (1985) surveys earlier attempts to locate the substrate: Rossi's proposal that the right cerebral hemisphere — operating in gestalt, visuospatial, and apperceptive modes rather than the left hemisphere's verbal-analytical mode — is the site of archetypal imagery; Henry's extension of this to MacLean's tripartite brain, with the limbic system and brainstem together constituting something like the collective unconscious; and Stevens's more precise suggestion that DNA itself is "the replicable archetype of the species," carrying the formal predispositions that make certain patterns of experience inevitable across the species. Stevens's formulation is the most biologically rigorous, and it is also the one most faithful to Jung's own insistence that what is inherited is a mode of psychic functioning, not a content — comparable to the chick's disposition to emerge from the egg in a particular way, or the leaf-cutting ant's fulfillment of an image that includes "ant, tree, leaf, cutting, transport, and little ant-garden of fungi" (Jung, cited in Hogenson, 2001). Remove any element of that image and the instinct cannot function; the archetype and its situational context are inseparable.

McGilchrist (2021) presses the philosophical point that the archetype is not a stereotype — not a post-factum abstraction — but exists ante factum and is instantiated:

An archetype is like an old watercourse along which the water of life has flowed for centuries, digging a deep channel for itself. The longer it has flowed in this channel the more likely it is that sooner or later the water will return to its old bed.

The riverbed metaphor captures what the crystallographic analogy captures: a formal predisposition that shapes what flows through it without being identical to any particular flow.

Papadopoulos (2006) notes the psychoid dimension of the archetype — Jung's boldest move — where the archetype is not merely psychic but serves as "the bridge to matter in general," continuous with the structures governing inorganic matter. This is where the Pauli-Jung dialogue on quantum physics becomes relevant: just as quantum physics postulates irrepresentable elementary particles constituting matter, analytical psychology postulates irrepresentable archetypes constituting psyche, and both may be approaching the same stratum of reality from different angles.

The most honest summary is that the physical basis of archetypes is stratified. At the deepest level — the psychoid — the archetype is not locatable because it is not yet psychic; it is the formal ground from which both psyche and matter precipitate. At the next level, subcortical midline structures supply the affective core that Jung intuited and that affective neuroscience has since mapped. At the cortical level, the imagery and narrative forms of archetypal experience are distributed across visual, associative, and default-mode networks. The archetype is not in any one of these layers; it is the organizing principle that runs through all of them.

  • archetype — the form-giving pole of psychic life, paired with instinct as its reciprocal opposite
  • psychoid — the deepest stratum of the archetype, where psyche and matter lose their distinction
  • collective unconscious — the inherited layer of the psyche whose structural units are the archetypes
  • archetypal image — the specific figure through which an archetype becomes perceptible in consciousness

Sources Cited

  • Jung, C.G., 1938/1954, The Archetypes and the Collective Unconscious (CW 9i)
  • McGovern, Hugh et al., 2025, Eigenmodes of the Deep Unconscious
  • Samuels, Andrew, 1985, Jung and the Post-Jungians
  • McGilchrist, Iain, 2021, The Matter With Things
  • Hogenson, George, 2001, The Baldwin Effect: A Neglected Influence on C.G. Jung's Evolutionary Thinking
  • Papadopoulos, Renos K., 2006, The Handbook of Jungian Psychology