two step flow theory

The two-step flow model hypothesizes that ideas flow from mass media to opinion leaders, and from them to a wider population. It was first introduced by Paul Lazarsfeld et al. in 1944 and elaborated by Elihu Katz and Lazarsfeld in 1955 and subsequent publications. Lowery and DeFleur argue the book was much more than a simple research report: it was an effort to interpret the authors' research within a framework of conceptual schemes, theoretical issues, and research findings drawn broadly from the scientific study of small groups Unlike the hypodermic needle model, which considers mass media effects to be direct, the two-step flow model stresses human agency.

According to Lazarsfeld and Katz, mass media information is channeled to the "masses" through opinion leadership. The people with most access to media, and having a more literate understanding of media content, explain and diffuse the content to others.

Based on the two-step flow hypothesis, the term “personal influence” came to illustrate the process intervening between the media’s direct message and the audience’s reaction to that message. Opinion leaders tend to be similar to those they influence—based on personality, interests, demographics, or socio-economic factors. These leaders tend to influence others to change their attitudes and behaviors. The two-step theory refined the ability to predict how media messages influence audience behavior and explains why certain media campaigns do not alter audiences’ attitudes. This hypothesis provided a basis for the multi-step flow theory of mass communication.

hypodermic needle theory

MAGIC BULLET/ HYPODERMIC NEEDLE/ STIMULUS RESPONSE THEORY

Before the first World War, there was no separate field of study on Communication, but knowledge about mass communication was accumulating. An outcome of World War I propaganda efforts, the Magic Bullet or Hypodermic Needle Theory came into existence. It propounded the view that the mass media had a powerful influence on the mass audience and could deliberately alter or control peoples' behaviour.

Klapper (1960) formulated several generalizations on the effects of mass media. His research findings are as follows: "Mass-media ordinarily does not serve as a necessary and sufficient cause of audience effect, but rather functions through a nexus of mediating factors and influences. These mediating factors render mass-communication as a contributory agent in a process of reinforcing the existing conditions."

The main mediating factors which he considers responsible for the functions and effects of mass communications are

- selective exposure i.e., people's tendency to expose themselves to those mass communications which are in agreement with their attitudes and interests; and

- selective perception and retention i.e., people's inclination to organize the meaning of mass communication messages into accord with their already existing views.