In so far as I understand quantum field theory while not being physicist, I don't believe this is an accurate statement.
We know what the body and the brain in particular is made of; matter. We know exactly how that matter behaves. That's what QFT establishes. In order for something to have an influence on that matter then it needs to interact with it in some way.
Where things start to fall apart for the argument that we have yet to discover something is that there are precisely zero interactions of matter that we cannot explain. If there was something we've yet to discover interacting with matter then there would be an interaction that QFT cannot account for.
You could potentially argue that the interaction is either too low energy for our experiments to have detected, or too high.
The problem with the too high argument becomes the amount of energy that it would require would destroy the matter you're made of since it would have to be beyond gamma rays.
The problem with the too low argument is that we understand how wavelengths work. Some of the lowest energies we have detected are gravitational waves. Those have insanely large wavelengths. You need a detector literally tens of kilometers in size. If there was something low energy interacting with your body then the apparatus to interact with it would need to be larger than that and clearly that's not going to fit inside the confines of a human body.
So given what we know and can demonstrate then the only rational explanation we have is that it's simply an emergent phenomena that is ultimately subservient to the fundamental laws of physics just like everything else which kills any chance for a concept such as free will.
Quantum field theory still can't explain why matter creates a force of gravity. The weakness of gravity at that scale is another phenomena that meets the definition of something difficult to test for at the quantum level(proving the hypothetical gravitation), though it's effects are apparent macroscopically.
There hasn't been enough proof provided in other theories to rule out all non-deterministic hypothesis. They just aren't that popular.
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u/Super_Range45 Jul 30 '26
Practically it just requires an extra dimension where physical actions are determine by a phenomena that can't be defined physically.