Final answer:
A common criticism of both the Milgram and Stanford Prison experiments is the ethical concerns related to the psychological impact on participants. Both involved extreme scenarios with significant emotional distress and potential harm.
Step-by-step explanation:
A common criticism of both the Milgram experiment and the Stanford Prison experiment revolves around ethical concerns and the psychological impact on the participants. In the Milgram experiment, participants experienced extreme emotional distress believing they were administering electric shocks to others. Similarly, the Stanford Prison experiment, conducted by psychologist Philip Zimbardo, led to an unplanned halt of the study due to the negative psychological consequences on the 'prisoners' and the abusive behavior of the 'guards'.
Both experiments raised questions about the morality of using deception in psychological research and the extent to which researchers should expose participants to potentially harmful situations. Additionally, the Stanford Prison experiment faced criticism regarding the validity of its findings due to participants possibly acting according to the expectations set by the experimental setup.