What were the four phrases used as prods in the experiment?
The prods were: (1) "Please continue," (2) "The experiment requires that you continue," (3) "It is absolutely essential that you continue," (4) "You have no other choice; you must go on."
What limitation exists regarding participants' belief in the experiment's authenticity?
A significant limitation is that some participants may not have believed the setup was real, affecting their behavior and the validity of the findings.