Deception refers to concealment of the purpose and procedures of a study from the participants.
Other /More definition:
Deception means concealing or camouflaging the real purpose of an experiment from the participants; a research technique in which the participant is misled about some aspect of the project which may be unethical. Sometimes, Deception is used in research when knowing the true purpose of a study would change the participants' responses or produce non-veridical data.

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