changes in addition to studies which deal with changes which may reason ably be called sudden because they result from single-experience sit uations.2 All of these studies indicate the possibility of causing changes 1 Sturges, H. A. Studies in the Dynamics of Attitude. Mss. (1924). Sturges, H. A. The Theory of Correlation Applied in Studies of Changing Attitudes/ ' American Journal of Sociology, XXXIII (September, 1927), pp. 269-275. Bogardus, E. S. Analyzing Changes in Public Opinion/' Journal of Applied Sociology, IX (May-June, 1925), pp. 372-381. Bogardus, E. S. Mutations of Social Distance/' Journal of Applied Soci ology, XI (September-October, 1926), pp. 77-84. Rice, S. A. Differential Changes of Political Preference under Campaign Stimulation/ ' Journal of Abnormal and Social Psychology, XXI (October-December, 1926), pp. 297-303. Zeleny, L. D. A Measure of Social Opinions of Students/' Journal of Applied Sociology, XI (September-October, 1926), pp. 56-64. Young, D. ' ' Some Effects of a Course in American Race Problems of the Race Prejudice of 450 Undergraduates at the University of Pennsylvania/ ' Journal of Ab normal and Social Psychology, XXII (October-December, 1927), pp? 235-242. Katz, D., and Allport, F. H. Students' Attitudes. Syracuse, New York: Crafts man Press, 1931. 2Moore, H. T. The Comparative Influence of Majority and Expert Opinion/' American Journal of Psychology, XXXII (January, 1921), pp. 16-20. Willey, M. M., and Rice, S. A. William Jennings Bryan as a Social Force/' Social Forces, II (March, 1924), pp. 338-344. Wheeler, D., and Jordan, H. ( ' Changes of Individual Opinion to Record with Group Opinion/ ' Journal of Abnormal and Social Psychology, XXIV (July-Sep tember, 1929), pp. 203-206. Paget, E. H. Sudden Changes in Group Opinion/' Social Forces, VII (March, 1929), pp. 438-444. Arnett, C. E., Davidson, H. H., and Lewis, H. N. Prestige as a Factor in Attitude Changes/' Sociology and Social Besearch, XVI (September-October, 1921), pp. 49-55. Thurstone, L. L. The Measurement of Change in Social Attitudes/' Journal of Social Psychology, II (May, 1931), pp. 230-235; The Influence of Motion Pic tures on Children's Attitudes, Journal of Social Psychology II (August, 1931), pp. 291-305. Peterson, R. C, and Thurstone, L. L. The Effect of a Motion Picture Film on Children's Attitudes Toward Germans, Journal of Educational Psychology, XXIII (April, 1932), pp. 241-246. 663
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Daniel H. Kulp (1934) studied this question.