Obtrusive and unobtrusive are opposites. Obtrusive means obvious, and unobtrusive means not obvious.
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An unobtrusive observation is when an experimenter simply watches and takes notes of the behavior of the subject in either a natural or laboratory setting WITHOUT any kind of interaction between the experimenter and subject.This is the opposite of an obtrusive observation in which the experimenter DIRECTLY interacts with the subject. For example, in a social environment, the experimenter makes eye contact and smiles at an individual walking by to watch for a response. In an unobtrusive observation, the experimenter would simply watch the way the subject responds to other people but DOES NOT deliberately smile to watch for a response.
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