In milgram's study on obedience, informing the participants that it was experiment on learning and memory is an example of

I believe the answer is: Deception

in research terms, Deception is an act to falsely misdirect the information given to the subjects of the research.
This form of action is considered as a direct violation of an ethical standard that could be punished through legal courses depending on the damage that created because of the research.

He was an adventurer and writer who established a colony near roanoke island, in present day north coralina.