Can you point me to a paper or other source that proves that the brain is the seat of consciousness? Or that disproves other theories?

I am familiar with the works of Oliver Sacks, Paul Broks, and others, who have spent their lives researching damage to brains and the potential consequences for the psyche. I agree that it sounds like damage to the brain can have big impact, but none of that research, as far as I am aware, proves or even tries to argue that the brain is the only component necessary for consciousness to exist.

I am not interested in beliefs in one theory over another. I am not even asking for probabilities. I am asking for a scientific approach, which is to detail all possible (potentially fringe) theories until they're proven wrong. Anything else is the business of religion.

    Singer, J., & Damasio, A. (2025). The physiology of interoception and its adaptive role in consciousness. Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 380(1939), 20240305. https://doi.org/10.1098/rstb.2024.0305

We think that organs can be replaced with little apparent change in consciousness (- this is an active research area, too, by the way). There is also research into how body tissues may form a part of what other theories place exclusively in the brain.

    Aderinto, N., Olatunji, G., Kokori, E., Ogieuhi, I. J., Moradeyo, A., Woldehana, N. A., Lawal, Z. D., Adetunji, B., Assi, G., Nazar, M. W., & Adebayo, Y. A. (2025). A narrative review on the psychosocial domains of the impact of organ transplantation. Discover mental health, 5(1), 20. https://doi.org/10.1007/s44192-025-00148-y

> "Having its own enteric nervous system, sometimes referred to as the “second brain,” the gut is also an immune organ and has a large surface area interacting with gut microbiota. The gut has been shown to play an important role in many physiological processes, and may arguably do so as well in perception and cognition."

    Boem F, Greslehner GP, Konsman JP and Chiu L (2024) Minding the gut: extending embodied cognition and perception to the gut complex. Front. Neurosci. 17:1172783. https://doi.org/10.3389/fnins.2023.1172783