The Hypodermic Needle Theory and Cultivation Theory

Cultivation theory is a social theory which examined the long-term effects of television on American audiences of all ages.
Developed by George Gerbner and Larry Gross of the University of Pennsylvania, cultivation theory derived from several large-scale research projects as part of an overall research project entitled 'Cultural Indicators'. The purpose of the Cultural Indicators project was to identify and track the 'cultivated' effects of television on viewers. They were "concerned with the effects of television programming (particularly violent programming) on the attitudes and behaviors of the American public" (Miller, 2005, p. 281).
Gerbner and Stephen Mirirai 1976) assert that the overall concern about the effects of television on audiences stemmed from the unprecedented centrality of television in American culture. They posited that television as a mass medium of communication had formed in to a common symbolic environment that bound diverse communities together, socializing people in to standardized roles and behaviours. They compared the power of television to the power of religion, saying that television was to modern society what religion once was in earlier times.
http://en.wikipedia.org/wiki/Cultivation_theory

The hypodermic needle model (also known as the hypodermic-syringe model) is a model of communications also referred to as the "magic bullet" perspective, or the transmission-belt model. Essentially, this model holds that an intended message is directly received and wholly accepted by the receiver. The model is rooted in 1930s behaviorism and is largely considered obsolete today.
The "Magic Bullet" or "Hypodermic Needle Theory" of direct influence effects was not as widely accepted by scholars as many books on mass communication indicate. The magic bullet theory was not based on empirical findings from research but rather on assumptions of the time about human nature. People were assumed to be "uniformly controlled by their biologically based 'instincts' and that they react more or less uniformly to whatever 'stimuli' came along" (Lowery & DefFleur, 1995, p. 400). The "Magic Bullet" theory graphically assumes that the media's message is a bullet fired from the "media gun" into the viewer's "head" (Berger 1995). Similarly, the "Hypodermic Needle Model" uses the same idea of the "shooting" paradigm. It suggests that the media injects its messages straight into the passive audience (Croteau, Hoynes 1997). This passive audience is immediately affected by these messages. The public essentially cannot escape from the media's influence, and is therefore considered a "sitting duck" (Croteau, Hoynes 1997). Both models suggests that the media is vulnerable to the messages shot at them because of the limited communication tools and the studies of the media's effects on the masses at the time (Davis, Baron 1981).
http://en.wikipedia.org/wiki/Hypodermic_needle_model