When I read “Evolutionary Epistemology” I was startled to realize that ‘truth’ was not fundamental but an encapsulation of useful complex patterns in the brain.
The eye was once thought by some to be too complex to have evolved. Today there are highly plausible explanations as well as evidence that the eye has indeed evolved independently many times. The evolution of the brain’s ‘truth tool’ has not been speculated upon to my knowledge. Being useful is not an explanation—jet engines are useful and they did not evolve. We designed jet engines without knowledge of the evolution of flight. Yet I think it may be useful from an engineering perspective to speculate on how intelligence evolved. That is a long road but it may be the only road.