sentences:  Societal reinforcement of the belief was hypothesized by Davis to confirm for the zombie individual the zombie state, and such individuals were known to hang around in graveyards, exhibiting attitudes of low affect.Davis's claim has been criticized, particularly the suggestion that Haitian witch doctors can keep "zombies" in a state of pharmacologically induced trance for many years.Symptoms of TTX poisoning range from numbness and nausea to paralysis — particularly of the muscles of the diaphragm — unconsciousness, and death, but do not include a stiffened gait or a deathlike trance.