What Really Happens With Group Visions

Several people on the blog have pushed back on my claim that group hallucinations (what I’ve called non-veridical visions) can occur.  Psychologically, is that really possible?  How is it actually possible that a group of, say, twelve people could have the same mental breakdown leading them to see exactly the same thing at the same time?

First, some people have objected to my term “vision” since psychologists don’t use that term.  They talk instead about “hallucinations.”   OK, I’ll concede t...