Have you ever seen something from the corner of your eye, but checked again and it was not there?
Simply put, a hallucination is "the perception of something that is not actually there". The following infographic explains how visual hallucinations begin in the brain and the three different types of disturbances that can cause them.
The infographic continues with listing the various types of hallucinations as well as the causes and treatments for them.
View the full infographic below.
Click on image to enlarge
Click on image to enlarge
[via Science Dump]