I have discussed a lot of this here, but the fundamental point of this essay is that illusions are a matter of how you handle, and use, the mental image system. Some people will have better or worse illusions at different frequencies of the visual spectrum, compared with each other. This, in turn, can vary from person to person. Some people will have greater or less of their illusions corrected with training.
But a person might have an illusion at one frequency, and then have it corrected at another frequency, and so on. So there is a gradient (also known as a scale) between the relative strength of the illusions in each frequency. A person might have a good illusion at one frequency, and then have it corrected at another frequency; thus the scale is higher towards the correct position.
If this does not occur, the difference between those two frequencies will go away as they become more aligned, as does the difference in strength.
The way a person perceives illusions is influenced by what frequencies he has the training most developed at and by how well he has learned to correct the illusions. When you are told by others that you are illusory, that it is just your perception, rather than the truth as stated or understood by others or when he has used the appropriate training, then you will be more likely to be unaware of your illusions, as we are here.
Some people can’t remember where they were before the illusion, and so they think they are illusory. Others know where they were, but still get confused. The same person can have an illusion somewhere, and then remember it later at another time and place. (This is the “double” illusion, the illusion that you are the person you know rather than the person who is illusory.)
This illusion pattern has nothing to do with the color you see. It is due to the way your brain is processing information. In response to seeing and hearing a particular color, the visual system activates an array of different colored cells, and one of these is the cells representing the illusion. These are called cones. The cell in the same color (red) is activated by seeing that color, and the cell in the opposite color is activated by seeing that color. The brain is doing exactly the same thing; it activates one color at certain moments, and then another at other times.
How much of an illusion is perceived?
Some people with an effective illusion-training program do not perceive much at all,