The ethical principle of "Debriefing" means that participants must be told the true purpose and nature of an experiment after it is over.
If participants have been misled, they must be informed of this and explained. Asking them if they have any questions is necessary, and any queries they may have should be answered honestly and completely.
Experimenters should take reasonable measures to ensure that participants understand debriefing, and debriefing should occur as soon after the experiment as practicable and be as thorough as possible.
The goal of the debriefing is to clear up any misunderstandings and concerns that the participants may have regarding the research and to leave them feeling knowledgeable, dignified, and like their time was not wasted.
Hence, the Ethical Principle of Debriefing is used to keep participants informed after a psychological experiment.
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