Perceptional Delay-Triggered Mental Failure

Perceptional Delay-Triggered Mental Failure (abbreviated PDTMV Syndrome, colloquially referred to as Zombie Syndrome) is a unique, threatening mental disorder discovered in the early-26th Century. The condition may evolve after the brain of any susceptible species is abruptly reanimated after having remained dormant for excessive periods of time repeatedly. Cryonic-sleep is the primary cause of this disorder within the UNSC Defence Force. Unfortunately, it is preformed rather often.

Although never immediately apparent, symptoms of this disorder include severe stress, aggression, constant uneasiness and paranoia, repetitive mental lapses, increased agility and hyperactivity, along with the standard effects of intoxication.

Aggression, stress, hyperactivity, and increased agility express the victim's desire for mental and physical activity, while mental lapses and the effects of intoxication are due to the victim's loss of brain cells due to inactivity. Such mixed feelings and newfound limitations tend to affect it's victims on a deep emotional levels, causing them to seek social seclusion.