A new type of hallucination has been identified by a team at the University of Derby: an ‘inverted hallucination’ is one where you can’t see something that is really there.
People often hallucinate after losing a loved one or pet, they’re called “Grief Hallucinations”. One study found over 80% of elderly patients experience hallucinations of their departed spouse one month after their passing.
In 1954, an Irishman, after taking “a good swig” from a beer bottle, saw leprechauns all over the place. Unfortunately, the beer bottle contained not beer but a highly poisonous industrial chemical. He realized his mistake at once, drunk salt water and got some of it up. Nevertheless he was “deeply inebriated” and went into coma for 36 hours. Coming out of the coma he had paranoid delusions. That night he awoke in delirium and saw that the ward was its usual length, but only was about two feet high. “In response to my cries, a little nurse 12 inches high ran to my bed. I told her I was afraid, so she tried to reassure me and went away to get a hot drink. While she was away, other nurses came to bedside and were later followed by a doctor. They were all about 12 inches tall. I recognized all of them as the nurses and doctor I had seen before. The only other person besides myself who seemed the normal size was a patient in the bed next to mine. I was terribly afraid while all this was going on. They changed my shirt and gave me an injection. The next morning everything went back to its usual size.” Today, this disorienting neurological condition is known as Alice in Wonderland syndrome or lilliputian hallucinations.
Hallucinations can occur in any sensory modality—visual (sight), auditory (sound), olfactory (smell), gustatory (taste), tactile (touch), equilibrioceptive (balance), nociceptive (harm), thermoceptive (temperature), and chronoceptive (time).
68% of people in one study experienced “phantom vibration syndrome”—a sensory hallucination where you mistakenly think your phone is buzzing.
The first sensory deprivation tank was created in 1954. Since then people have experienced hallucinations, out of body experiences and even parallel universes while in these chambers.
Blind people experience visual hallucinations when they take LSD.