General Trends in Effects Theory Bullet Theory Model Moderate- Effects Model Limited-Effects Model 1920 1930 1940 1950 160 167 198p 1990 1927 19.37 1984 sswell's Institute 1954 ppaganda for Voting The Great Propaganda 198a195 1960 1972 Report Communicaton to the 8 1947 98 1976 Mr. Biggott Peoole's Unde Study ○hoice 1970 1973 Tichenor, Noelle Donohue, and Olien Spiral of Figure 13.I Size of effect due to mass comunication for various theories. General Trends in Effects Theory