If a person is born invisible, will the color in his dream be black?

From our normal point of view, it should be black. There is only black in the world without any light. It is black! In their dreams, just like in their lives, the visual area of the brain is inactive, and only other senses, such as hearing, touch and taste, are active. So for them, there is no color in dreams, and black is also color, so there will be no black in dreams.

But in life, they will hear other people's descriptions of colors. For example, he knows the white of this table. After he touches the table, his brain will construct the shape of the table. But that's what it is. He can't feel it visually. He can only attach the "white" described by others as the attribute of the table, and only through the notice of others can he know the attribute of "color" of various objects. The "color" in his brain is more like the label of an object than the color we see.

But that's just the feeling that ordinary people can see the world around them For a completely blind person, because the world he experiences will not be unaware of any color in his daily life, he will not have an intuitive perception of any color. For example, he won't know what is black and what is white. Even if you tell him what color black is, he won't feel it, because the color can only be seen! For decades, researchers have been evaluating the sensory experience of the blind, but because their research is based on the dream experience of people with normal vision, taking the dream content of people with normal vision into account can better understand the differences of blind dreams.

Some small sample studies have found that the dreams of the blind are mainly composed of touch, temperature, taste and sound. In fact, dreams are the result of brain wave integration when people turn off specific sensory reception sources. If you feel that you saw colorful things, smelled food and heard sweet music in your dream ... it may be that there are similar stimuli around you, and more logical experience makes you feel that you should have corresponding feelings.