I'm not trying to demonstrate that my claims are true. I'm trying to demonstrate that it is meaningless to discuss these topics in the first place, because we don't understand the workings of the mind nearly well enough to distinguish things like "truthfulness" and "concepts".
The fact that we don't know exactly how our brains work, doesn't mean we cannot observe the results of their work.
And as I have demonstrated above, humans, and for that matter other species on this planet featuring capable brains like Corvidae or Cetaceans, do in fact have a concept of truth: They are capable of recognizing false or misleading information as being incongruous with objective reality: A raven that sees me putting food into my left hand, will not jump to a patch of ground where I pretend to put food with my right hand.
This is despite the fact that my actions of "hiding the food" with the empty hand are stochastically indistinguishable from an action of actually hiding food from with my left hand.
