1. Deception allows the experimenter to increase the impact of a laboratory setting Presumably as the experimental situation becomes more realistic and involving, the independent variables are more Likely to have the impact (but not necessarily the results) intended by the experimenter calls this internal validity, a necessary condition for generalizing from the laboratory to the outside world.
As an extreme example of increasing internal validity consider a study by Berkun, et al. (1962) which assessed the effects of panic upon performance. In this study military personnel were led to believe they were in immediate danger of losing their life because of misdirected incoming artillery shells. The only means of escape was to repair a faulty radio transmitter and contact someone outside the area. Of course, the personnel were never really in danger. But it seems safe to conclude that the study did provide an accurate view of performance under emergency conditions.
Some......
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