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Just because we can’t detect all of reality or define reality doesn’t mean that a universal reality doesn’t exist. Sure, reality is not universally experienced, since each individual is limited in their perceptions of the world around them. But there can be one true reality- it’s just that no one person is capable of perceiving it. We each have our own unique perceptions, and there are also aspects of reality (like UV light) that no human can perceive. That doesn’t mean UV light doesn’t exist- we can measure it in other ways. It’s just not feasible to detect or measure all aspects of reality.

I’ve thought of a few examples of the I-function influencing vision. First, when someone reads a sentence that contains a typo (such as a spelling error or a repeated word), they often don’t notice the typo. The eyes are assumedly detecting each letter correctly, so it must be the I-function that compares the input to previous remembered input and fixes the typo. Second, visual hallucinations are a relevant topic that I covered in my recent webpaper on alien abductions. It’s possible for someone to have a vague hallucination and fill in the details (at that time, or later) based on their prior knowledge, much as it is common for witnesses to recreate memories that end up being false. This just goes to show that we can’t trust any one person’s perception because not only is it influenced by what input is available to them, but it can be changed within the brain, sometimes without the person knowing anything was changed.