Psychosis
Psychosis was a psychological disorder where an individual's mental state had lost contact with reality. Individuals suffering from this state were known as psychotic.

Early protests against the use of the transporter on Humans included the claim that it caused psychosis. Inventor Emory Erickson later recalled these concerns in a dinner on  in 2154. ()

In 2268, Commander Spock speculated to Captain Kirk that John Gill may have been suffering from a deep psychosis, as opposed to Kirk's speculation of his case being one of semi-divine detachment. ()

In 2372, Lieutenant Tuvok asked The Doctor if Crewman Lon Suder was psychotic, but this possibility was ruled out by examining Suder's neurogenetic markers. ()

Types
 Schizophrenia 
 Transporter psychosis 
 Temporal psychosis

External link 
 
Psychological conditions