 Henri Laborit, one of the founders of modern neuropsychopharmacology, carried out experiments in the 1970s that showed that illness quickly occurred when there was inhibition of action in rats.Rats in exactly the same stressful situations but whom were not inhibited in their behavior (those who could flee or fight – even if fighting is completely ineffective) had no negative health consequences.He proposed that psychosomatic illnesses in humans largely have their source in the constraints that society puts on individuals in order to maintain hierarchical structures of dominance.