

Human: I've read that blind people see "nothing". When we as sighted people imagine nothing, we imagine "black", but that's not necessarily true. Do we know scientifically what blind people experience?

Assistant: Neurobiologists have discovered that blind people actually experience images in their heads that are similar to those experienced by sighted people. The difference is that blind people's images tend to be more basic and less differentiated, which means that blind people can only "see" a few objects, but they are able to recognize them quickly and confidently.


Human: I've read that blind people see "nothing". When we as sighted people imagine nothing, we imagine "black", but that's not necessarily true. Do we know scientifically what blind people experience?

Assistant: Blindness in different cases can be caused by very different things.  Many cases of congenital blindness are called "cortical blindness".  These are people who had normal vision, then had a stroke or brain damage as a child or adult, that blinded them.  If they haven't had visual input for a long time, their brain actually doesn't "see" any kind of images anymore.  We can use a brain scanner to see that their brain, when presented with pictures, doesn't recognize them.

However, other people who are blind were born that way.  Some scientists believe that when you're born without a working visual cortex, you can't recognize pictures as "pictures" - so for you, it doesn't matter if you see black or white.  I'm not sure this is entirely true, but I do think the
I've read that blind people see "nothing". When we as sighted people imagine nothing, we imagine "black", but that's not necessarily true. Do we know scientifically what blind people experience?
Neurobiologists have discovered that blind people actually experience images in their heads that are similar to those experienced by sighted people. The difference is that blind people's images tend to be more basic and less differentiated, which means that blind people can only "see" a few objects, but they are able to recognize them quickly and confidently.
Blindness in different cases can be caused by very different things.  Many cases of congenital blindness are called "cortical blindness".  These are people who had normal vision, then had a stroke or brain damage as a child or adult, that blinded them.  If they haven't had visual input for a long time, their brain actually doesn't "see" any kind of images anymore.  We can use a brain scanner to see that their brain, when presented with pictures, doesn't recognize them.

However, other people who are blind were born that way.  Some scientists believe that when you're born without a working visual cortex, you can't recognize pictures as "pictures" - so for you, it doesn't matter if you see black or white.  I'm not sure this is entirely true, but I do think the