eHow
May 2, 2011
Mass media have significant influence on society, and although print has  been supplanted by broadcast in many cases, it is still a viable medium  with powerful effects on audiences. Many conflicting theories exist  about the effects of print media. Most are based on the theory of uses  and gratifications, which focuses on what people do with media, rather  than what media does to people.
Agenda-Setting
Agenda-setting theory, developed in 1972 by Maxwell McCombs and David  Shaw, suggests that media do not tell us what to think, but what to  think about. Media determine what is newsworthy by giving those stories  prominence. A topic that is prominent in news coverage gains salience in  public opinion. This results in the media dictating the topics on the  public agenda. 
Related to agenda-setting is priming theory, which suggests that media  prime the mind to make associations by bringing certain ideas to the  forefront. Political campaigns make use of priming by establishing what  criteria people use to evaluate candidates. If Candidate A focuses on  integrity, audiences evaluate Candidate B's integrity as well. 
Framing is often discussed alongside priming. Media frame information by  giving it particular context and by making some aspects of a text more  salient than others. An example of framing is the media discussion of  health care changes through the lens of economic considerations versus  ethical considerations.
Media Violence
The media have been charged with promoting violent behavior in  audiences, and several theories describe this phenomenon. The social  learning model, first proposed in the 1960s by Albert Bandura, asserts  that through observing media models, viewers learn which behaviors are  rewarded and which are punished. The desensitization effect suggests  that prolonged exposure to media violence can lead to emotional  desensitization to real-world violence. The third media violence effect  is the fear effect, which purports that heavy exposure to media violence  causes viewers to become fearful of the world around them, afraid to  become victims of violence.
Political Media
Endless research has been done on the effects of political campaigns on  viewers. One theory of political media effects is the third-person  effect. The third-person perception refers to the tendency for people to  believe that others are more affected by media messages than they are  themselves. The effect on those affected by third-person perception is a  decrease in voter turnout, likely because they believe that others are  receiving a powerful message whose effects they cannot overcome.
The reinforcement theory states that people seek out and retain  information that is supportive of their already held beliefs. This is  consistent with the partisan breakdown of Fox News and MSNBC viewers.  People engage in reinforcement through selective exposure (avoiding  challenging viewpoints), selective perception (skewing information to  coincide with their viewpoints) and selection retention (remembering  only information they agree with.) Reinforcement theory is closely  related to cognitive dissonance theory, which describes how people are  motivated to reduce uncertainty when faced with conflicting ideas.  People attempt to reduce dissonance through rationalization, denial and  adaptation of beliefs.
Spiral of Silence
Elisabeth Noelle-Neumann, who introduced the Spiral of Silence theory in  1974, wrote, “To the individual, not isolating himself is more  important than his own judgment.” The spiral of silence refers to the  tendency for people to silence their unpopular opinions to comply with  the masses. Media reinforce the spiral by giving the illusion of public  consensus when they repeat dominant messages.
Resources
Communication Monographs; "Audience Activity and Media Use"; Alan M. Rubin; March 1993
McGraw Hill Learning Center: Theories of Mass Communication
References
The Public Opinion Quarterly; "Uses and Gratifications Research"; Elihu Katz, et al.; Winter 1973
Political Communication; "Framing and the Public Agenda: Media effects  on the importance of the federal budget deficit"; Amy E. Jasperson, et  al.; 1998
McQuail's Reader in Mass Communication Theory; "Children and Television  Violence in the United States"; Ellen Wartella, et al.; 2002
Journalism & Mass Communication Quarterly; "Third-Person Effects on  Political Participation"; Stephen A. Banning; Winter 2006
Pew Research Center: Partisanship and Cable News Audiences
Journal of Communication; "The Spiral of Silence: A theory of public opinion"; Elisabeth Noelle-Neumann; June 1974
 
 
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