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> It reminds me when I read that ee can only dream of faces we've seen in the past, whether we actively remember them or not. The brain cannot invent these.

Do you have a source for this, it looks very suspicious

1) The memory is highly compressed. We remember only some interesting details and then fill the gaps. It's easy to add false information in the gaps, for example the experiment with the inexistent stop sign https://en.wikipedia.org/wiki/Misinformation_effect

2) Even if it where true: How did they test it?!

I think "cannot" is a bit too strong a claim. The brain literally invents faces when it interprets the signals from our eyes. Are you saying that it can't make up signals that don't exist? I don't see any reason to assume that it couldn't.

I think it is reasonable to expect that the brain will dream up faces based on what it has seen before, but it's not like you've never seen anything other than faces.

> We can only dream of faces we've seen in the past, whether we actively remember them or not. The brain cannot invent these.

How would anyone test this claim?