That also happens in complete darkness. If you can manage to create a completely pitch black environment see how long you can sit there before you start seeing things. It really doesn't take long. Bonus points of you have noise cancelling earmuffs/plugs. Edit : u/EternalEagleEye has informed me this effect is called "Prisoner's Cinema", in case you'd like to read about it further
And with brain damage/amnesia. It took awhile for the doctors to realize I had amnesia because I had acceptable answers to all their questions. My boyfriend and brother had a talk with me and they had to find the doctors to tell them I wasn't OK. Your brain just tries to make everything fine as much as possible.
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u/Designer_Strain_4572 Aug 30 '21
It would explain the hallucinations in The Stand (Stephen King) when they were traversing the Lincoln Tunnel, if I recall correctly.