Perhaps most damning to the traditional view of character are the results of the experiments conducted by Stanley Milgram in the 1960s and Philip G. Zimbardo in 1971. In the first of these experiments, the great majority of subjects, when politely though firmly requested by an experimenter, were willing to administer what they thought were increasingly severe electric shocks to a screaming "victim." In the second, the infamous Stanford prison experiment, the planned two-week investigation into the psychology of prison life had to be ended after only six days because the college students who were assigned to act as guards became sadistic and those who were the "prisoners" became depressed and showed signs of extreme stress. These and other experiments are taken to show that if humans do have noble tendencies, they are narrow, "local" traits that are not unified with other traits into a wider behavioral pattern of being.