Imagine you are stranded in the desert. Thirst sets in and you start hallucinating and seeing mirages. You are desperately scanning the horizon for some way to survive and monkey brain pattern finding says oh hey that looks like it might be an oasis up ahead! But, its still pretty early on in this expedition and you know its hella unlikely its actually an oasis. The hallucination is the sensory input being wack. But your mental state and ability to work it out keeps it from being a delusion.
Fast forward a bit and the thirst is killing you. Now its getting hard to think and you start getting more delirious. Now when you see another mirage, you are convinced it must surely be an oasis! You run up and pool a scaling handful of sand up to your mouth and it feels cool as ice as you sip back a burning gulp of sand. When you stop having the mental capacity to distinguish the erroneous sensory input, it becomes a delusion. Its still a hallucination, it doesnt actually exist, but you are delusional and can’t tell the difference anymore.
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