Several decades later, Wade Davis, a Harvardethnobotanist, presented a pharmacological case for zombies in two books, The Serpent and the Rainbow (1985) and Passage of Darkness: The Ethnobiology of the Haitian Zombie (1988). Davis traveled to Haiti in 1982 and, as a result of his investigations, claimed that a living person can be turned into a zombie by two special powders being entered into the blood stream (usually via a wound). The first, coup de poudre (French: 'powder strike'), includes tetrodotoxin (TTX), the poison found in fugu. The second powder is composed of dissociatives such as datura. Together, these powders were said to induce a death-like state in which the victim's will would be entirely subject to that of the bokor. Davis also popularized the story of Clairvius Narcisse, who was claimed to have succumbed to this practice. There is wide belief among the Haitian people of the existence of the "zombie drug".[citation needed]Symptoms of TTX poisoning range from numbness and nausea to paralysis, unconsciousness, and death, but do not include a stiffened gait or a deathlike trance. According to neurologist Terence Hines, the scientific community dismisses tetrodotoxin as the cause of this state, and Davis' assessment of the nature of the reports of Haitian Zombies is overly credulous.[5]Others[who?] have discussed the contribution of the victim's own belief system, possibly leading to compliance with the attacker's will, causing psychogenic ("quasi-hysterical") amnesia, catatonia, or other psychological disorders, which are later misinterpreted as a return from the dead. Scottish psychiatrist R. D. Laing further highlighted the link between social and cultural expectations and compulsion, in the context of schizophrenia and other mental illness, suggesting that schizogenesis may account for some of the psychological aspects of zombification. >> By WikiPedia

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