> Like how can you even trust your senses if you're able to conjure up full sensual experiences in your imagination?
Wow, this is fascinating, and it's incredibly hard to describe something you've just taken for granted!
When I'm writing this down, I can "hear" my own voice narrating what I'm writing, sometimes talking ahead as my typing catches up, sometimes the other way around. But I have no difficulty separating "real" sounds that have gone through my ears, from the sound of my mind's voice, if that makes sense. If I were to open my mouth and talk along with my mind's voice, it would become quiet, because there's now real sounds taking its place.
Visualizing things work sort of the same way, if someone says "think about a dog playing fetch!", I start seeing fragments/glimpses/moving images of my memories of dogs playing fetch, but it's more like having a movie screen in front of your eyes, I don't see the dog in the world as I see it, the mind's eye "sees" things on top of/in parallel to existing visual input. And staring at something that is visually boring, or closing your eyes, helps you see your mind's eye more clearly, since there's no overlap. The more visually interesting the real world is, the harder it is to clearly picture something in your mind. And just like with the mind's voice, you just know that what you're imagining isn't real.
So to answer your question: Actual hallucinations are what happens when you're unable to distinguish between the two, normally you have absolutely no problem doing so.
Wow, this is fascinating, and it's incredibly hard to describe something you've just taken for granted!
When I'm writing this down, I can "hear" my own voice narrating what I'm writing, sometimes talking ahead as my typing catches up, sometimes the other way around. But I have no difficulty separating "real" sounds that have gone through my ears, from the sound of my mind's voice, if that makes sense. If I were to open my mouth and talk along with my mind's voice, it would become quiet, because there's now real sounds taking its place.
Visualizing things work sort of the same way, if someone says "think about a dog playing fetch!", I start seeing fragments/glimpses/moving images of my memories of dogs playing fetch, but it's more like having a movie screen in front of your eyes, I don't see the dog in the world as I see it, the mind's eye "sees" things on top of/in parallel to existing visual input. And staring at something that is visually boring, or closing your eyes, helps you see your mind's eye more clearly, since there's no overlap. The more visually interesting the real world is, the harder it is to clearly picture something in your mind. And just like with the mind's voice, you just know that what you're imagining isn't real.
So to answer your question: Actual hallucinations are what happens when you're unable to distinguish between the two, normally you have absolutely no problem doing so.