Interesting. If I'm understanding you correctly, you're saying peoplpe dx w/sz would be less likely to be able to see the hidden picture. In my family it's the opposite. My son (dx w/sz) loved those stupid things when he was a kid. He collected books of them. He could always see the picture.

I, on the other hand, with no dx, have never seen the hidden picture.

BTW my son never sees the Charlie Chapin mask optical illusion, and I can't avoid seeing it: Schizophrenic Brains Not Fooled by Optical Illusion. He always sees the inside of the mask, and - try as I might - I always see the illusion of a tan colored face.