The term epiphenomenon marks one of the most radical positions in the philosophy of consciousness: the claim that consciousness is a causally inert by-product of physical processes. Whoever takes this position seriously must explain why they are defending it with the very consciousness whose efficacy they deny.
#Smoke Without Force
The word comes from the Greek: epi (upon, beside) and phainomenon (appearance). In general usage it denotes a concomitant phenomenon that issues from a process without acting back upon it. The classic image is the steam of a locomotive. It rises, is visible, belongs to the activity of driving — but it does not power the engine. The wheels turn without it.
Thomas Henry Huxley, biologist and champion of Darwinism, applied this image to consciousness in 1874. Mental states, Huxley argued, are like the whistle of the steam engine: they accompany the work of the machine but cause nothing. The brain processes stimuli, produces behaviour, and consciousness merely watches, unable to intervene. This position — epiphenomenalism — became the most consistent variant of materialism in the philosophy of mind.
#The Self-Contradiction
The difficulty of epiphenomenalism lies where one does not immediately expect it: in its own claim to truth. If consciousness has no causal power, then the thought “consciousness is an epiphenomenon” also has no causal power. It was not produced by reflection, weighing, and reasoning, but by blind neurochemical processes that happened to generate this sequence of words. The epiphenomenalist cannot justify why their conviction should be true, because justification presupposes that thoughts cause something — namely, other thoughts.
This objection has a name: performative self-contradiction. The assertion refutes itself in the act of being made. Whoever claims that no sentence can be true is thereby claiming the truth of a sentence. Whoever claims that consciousness is causally powerless exercises causal power through conscious thought at that very moment.
Nietzsche (1844—1900) describes here a position he analysed from various angles. His own stance toward consciousness was predominantly deflationary: he regarded it as a surface phenomenon, something derived and secondary compared to the unconscious drives. The will to power in Nietzsche is primarily an unconscious principle; consciousness accompanies it without being its actual bearer. The attitude he sketches — consciousness as “indifferent,” as the residue of a mechanical cosmos — names precisely what epiphenomenalism claims (cf. Nietzsche, The Will to Power).
#Mind and Matter: A False Separation
The epiphenomenon argument presupposes that mind and matter are two separate spheres, with matter as the cause and mind as the effect. Friedrich Wilhelm Joseph Schelling (1775—1854) had already questioned this presupposition at the end of the eighteenth century. In the Ideas for a Philosophy of Nature he formulates the fundamental problem of dualism:
For Schelling, mind and matter are not separate substances that must somehow interact in mysterious fashion. Nature is “the visible spirit, and spirit the invisible nature” (Schelling, 1797, Ideas for a Philosophy of Nature). From this perspective, the epiphenomenon problem does not arise in the first place, because the separation on which it rests is a false abstraction.
#Consciousness as a Fundamental Feature of the Cosmos
Natural philosophy in the tradition of Schelling, Goethe, and Jochen Kirchhoff (1944—2025) reverses the materialist relationship. Consciousness is primary. Matter does not come first only to eventually produce consciousness as a by-product. Rather, the cosmos itself is pervaded by consciousness. Jochen Kirchhoff speaks of consciousness as a “living operative force” and criticises materialist natural science as “bad metaphysics” — a metaphysical position that passes itself off as value-free science (cf. Kirchhoff, J., 2023, “Schelling: Genie der Naturphilosophie”).
“Consciousness can only arise from consciousness,” says Gwendolin Kirchhoff in a conversation on death and consciousness. “That dead matter simply gives birth to life is a bare assertion, never proven. Whoever claims the opposite can likewise only assert it” (Kirchhoff, G., 2024, “Die Anderswelt: Nachdenken uber den Tod (2)”). If that is true, then the question is not how matter produces consciousness, but why materialism clings so stubbornly to this question.
#The Existential Root
The question of why someone would want to declare consciousness an epiphenomenon is perhaps more revealing than the argument itself. Gwendolin Kirchhoff has formulated her own thesis: strict materialism springs from an emotional experience of isolation that eventually hardens into ideology. “I consider materialism the result of an existential depression. The depression comes first and then projects a world picture” (Kirchhoff, G., 2026, Everlast AI Debate). A world without an inner dimension, without a living cosmos, without spirit in nature — that is not a neutral research finding. It is the projection of a person who has lost contact with aliveness.
Whoever has understood the epiphenomenon as a concept has thereby also understood the limit of materialism. Every attempt to explain consciousness away confirms through its own execution that consciousness cannot be explained away. In philosophical consultation, we work with the experience that consciousness is not an illusion but the gateway to what is actually at work in one’s own life.
#Sources
Kirchhoff, G. (2024). “Die Anderswelt: Nachdenken uber den Tod (2)” [Video]. Gwendolin Kirchhoff, YouTube. https://youtube.com/watch?v=o-secv4Z-pM.
Kirchhoff, G. (2026). Everlast AI Debate: Kirchhoff vs. Bach [Conversation].
Kirchhoff, J. (2021). “Schelling: Genie der Naturphilosophie” [Video]. Jochen Kirchhoff — In Memoriam, YouTube. https://youtube.com/watch?v=Hw-jL1EER5Q.
Nietzsche, F. Der Wille zur Macht. Posthumous fragments.
Schelling, F. W. J. (1797). Ideen zu einer Philosophie der Natur. Breitkopf und Hartel.
Schelling, F. W. J. (1827). Zur Geschichte der neueren Philosophie. Cotta.
Schopenhauer, A. (1844). Die Welt als Wille und Vorstellung, Second Volume. Brockhaus.
Related entries: Philosophy of Consciousness, Natural Philosophy, Materialism, Consciousness and AI, Machine Consciousness