The fact that every individual has his breaking point has been known and, in a crude unscientific way, exploited from time immemorial. In some cases man's dreadful inhumanity to man has been inspired by the love of cruelty for its own horrible and fascinating sake. More often, however, pure sadism was tempered by utilitarianism, theology or reasons of state. Physi­cal torture and other forms of stress were inflicted by lawyers in order to loosen the tongues of reluctant witnesses; by clergymen in order to punish the unor­thodox and induce them to change their opinions; by the secret police to extract confessions from persons suspected of being hostile to the government. Under Hitler, torture, followed by mass extermination, was used on those biological heretics, the Jews. For a young Nazi, a tour of duty in the Extermination Camps was (in Himmler's words) "the best indoctrina­tion on inferior beings and the subhuman races." Given the obsessional quality of the anti-Semitism which Hitler had picked up as a young man in the slums of Vienna, this revival of the methods employed by the Holy Office against heretics and witches was inevitable. But in the light of the findings of Pavlov and of the knowledge gained by psychiatrists in the treatment of war neuroses, it seems a hideous and grotesque anachronism. Stresses amply sufficient to cause a complete cerebral breakdown can be induced by methods which, though hatefully inhuman, fall short of physical torture.

Whatever may have happened in earlier years, it seems fairly certain that torture is not extensively used by the Communist police today. They draw their inspiration, not from the Inquisitor or the SS man, but from the physiologist and his methodically condi­tioned laboratory animals. For the dictator and his policemen, Pavlov's findings have important practical implications. If the central nervous system of dogs can be broken down, so can the central nervous system of political prisoners. It is simply a matter of applying the right amount of stress for the right length of time. At the end of the treatment, the prisoner will be in a state of neurosis or hysteria, and will be ready to confess whatever his captors want him to confess.

But confession is not enough. A hopeless neurotic is no use to anyone. What the intelligent and practical dictator needs is not a patient to be institutionalized, or a victim to be shot, but a convert who will work for the Cause. Turning once again to Pavlov, he learns that, on their way to the point of final breakdown, dogs become more than normally suggestible. New be­havior patterns can easily be installed while the dog is at or near the limit of its cerebral endurance, and these new behavior patterns seem to be ineradicable. The animal in which they have been implanted cannot be deconditioned; that which it has learned under stress will remain an integral part of its make-up.

Psychological stresses can be produced in many ways. Dogs become disturbed when stimuli are unu­sually strong; when the interval between a stimulus and the customary response is unduly prolonged and the animal is left in a state of suspense; when the brain is confused by stimuli that run counter to what the dog has learned to expect; when stimuli make no sense within the victim's established frame of ref­erence. Furthermore, it has been found that the de­liberate induction of fear, rage or anxiety markedly heightens the dog's suggestibility. If these emotions are kept at a high pitch of intensity for a long enough time, the brain goes "on strike." When this happens, new behavior patterns may be installed with the great­est of ease.

Among the physical stresses that increase a dog's suggestibility are fatigue, wounds and every form of sickness.

For the would-be dictator these findings possess important practical implications. They prove, for example, that Hitler was quite right in maintaining that mass meetings at night were more effective than mass meetings in the daytime. During the day, he wrote, "man's will power revolts with highest energy against any attempt at being forced under another's will and another's opinion. In the evening, however, they succumb more easily to the dominating force of a stronger will."

Pavlov would have agreed with him; fatigue in­creases suggestibility. (That is why, among other rea­sons, the commercial sponsors of television programs prefer the evening hours and are ready to back their preference with hard cash.)

Illness is even more effective than fatigue as an intensifier of suggestibility. In the past, sickrooms were the scene of countless religious conversions. The scientifically trained dictator of the future will have all the hospitals in his dominions wired for sound and equipped with pillow speakers. Canned persuasion will be on the air twenty-four hours a day, and the more important patients will be visited by political soul-savers and mind-changers just as, in the past, their ancestors were visited by priests, nuns and pious lay­men.

The fact that strong negative emotions tend to heighten suggestibility and so facilitate a change of heart had been observed and exploited long before the days of Pavlov. As Dr. William Sargant has pointed out in his enlightening book, Battle for the Mind , John Wesley's enormous success as a preacher was based upon an intuitive understanding of the central nervous system. He would open his sermon with a long and detailed description of the torments to which, un­less they underwent conversion, his hearers would un­doubtedly be condemned for all eternity. Then, when terror and an agonizing sense of guilt had brought his audience to the verge, or in some cases over the verge, of a complete cerebral breakdown, he would change his tone and promise salvation to those who believed and repented. By this kind of preaching, Wesley converted thousands of men, women and children. Intense, pro­longed fear broke them down and produced a state of greatly intensified suggestibility. In this state they were able to accept the preacher's theological pro­nouncements without question. After which they were reintegrated by words of comfort, and emerged from their ordeal with new and generally better behavior patterns ineradicably implanted in their minds and nervous systems.