Um, you seem to be the only person in the thread stating that our perception is "unreliable" and I'm not sure what you mean.
I used "reliably" once, in an assertion that our perception is reliable, in the sense that it lacks dispersion.
I'm not sure what you mean by 'the mechanism for "lack of dispersion"' actually. It's just a property, like pink. What is the paint's mechanism for being pink? I don't know. It's just a property of the pigment, surely.