When the participant knowing the aim of the study could contaminate the results.
How is protection from harm described?
Participants must not be put in more risk than their daily lives. They must be protected from psychological and physical harm, including: embarrassment, stress, pressure, etc.
The ethical issues present in Ash's research:
Deception - Fake task, participants were told they were taking part in a study on visual perception and judgement.
Lack of informed consent - Participants were not fully aware of the experiment and its risks.
Lack of protection - A social pressure was involved as participants felt pressured to align with the majority, however, this is no more pressure than someone may experience in their day to day lives.
The ethical issues present in Zimbardo's research:
Deception - Participants were told the experiment was recording the psychological affects of prison, as a result, participants were well informed.
Lack of informed consent - Participants were not fully aware of the experiment and its risks.
Lack of protection - Prisoners were verbally assaulted and put in the 'hole' which is a form of psychological torture.
The ethical issues present in Milgram's research:
Deception - Participants were told that the experiment was about how punishment affects learning.
Lack of informed consent - Participants were not fully aware of the experiment and its risks.
Lack of protection: Subjects experienced lots of stress and pressure, some even experiencing seizures.