Final answer:
Stanley Milgram conducted the Milgram Experiment, and Philip Zimbardo conducted the Stanford prison experiment, both of which are related to self-punitive behavior and authority.
Step-by-step explanation:
The two researchers who conducted experiments related to self-punitive behavior are Stanley Milgram and Philip Zimbardo. They conducted the experiments as part of their research on the Stanford Prison Experiment. The experiments aimed to revisit the original findings and explore the role of participant self-selection in the observed cruelty. Milgram is well-known for his Milgram Experiment conducted in 1961, which investigated obedience to authority figures, where participants believed they were administering electric shocks to other individuals. On the other hand, Zimbardo carried out the Stanford prison experiment in 1971, exploring the psychological effects of perceived power, focusing on the struggle between prisoners and prison officers.