An experimenter finds that when a person takes part in a study they become quite nervous, when normally they are confident and assertive.This threatens the internal and external validity of their findings and is an example of what phenomenon?
A)Demand characteristics.
B)Experimental blind.
C)Regression.
D)Reactivity.
E)Test-retest reliability interacting with the experimental treatment.

Question

Quizplus · Accepted Answer

Reactivity occurs when individuals alter their performance or behavior due to the awareness that they are being observed. This phenomenon can threaten the validity of an experiment because the behavior observed may not reflect the participants' behavior under normal conditions, thus affecting both the internal and external validity of the findings.

An Experimenter Finds That When a Person Takes Part in a Study