"This experiment was designed to test the general hypothesis that test results will be modified by those aspects of the testing situation which are sometimes not carefully controlled or are treated as if they were unimportant. Thirty-six male subjects in two experimental groups and one control group were used to study the effects of perfunctory verbal comments and nonverbal actions on test results. The findings of the study suggest that such comments as "Good" or "Fine" and such actions as smiling and nodding by examiners have a decided effect upon test results. Thus it was indicated that examiners should be alert to the fact that even under presumably "standardized" conditions, it is possible for their behavior to be reflected in test results.".