hypodermic Theory

1. The Hypodermic Needle Model

Dating from the 1920s, this theory was the first attempt to explain how mass audiences might react to mass media. It is a crude model (see picture!) and suggests that audiences passively receive the information transmitted via a media text, without any attempt on their part to process or challenge the data. Don't forget that this theory was developed in an age when the mass media were still fairly new - radio and cinema were less than two decades old. Governments had just discovered the power of advertising to communicate a message, and produced propaganda to try and sway populaces to their way of thinking. This was particularly rampant in Europe during the First World War (look at some posters here) and its aftermath.
Basically, the Hypodermic Needle Model suggests that the information from a text passes into the mass consciouness of the audience unmediated, ie the experience, intelligence and opinion of an individual are not relevant to the reception of the text. This theory suggests that, as an audience, we are manipulated by the creators of media texts, and that our behaviour and thinking might be easily changed by media-makers. It assumes that the audience are passive and heterogenous. This theory is still quoted during moral panics by parents, politicians and pressure groups, and is used to explain why certain groups in society should not be exposed to certain media texts (comics in the 1950s, rap music in the 2000s), for fear that they will watch or read sexual or violent behaviour and will then act them out themselves.

2. Two-Step Flow
The Hypodermic model quickly proved too clumsy for media researchers seeking to more precisely explain the relationship between audience and text. As the mass media became an essential part of life in societies around the world and did NOT reduce populations to a mass of unthinking drones, a more sophisticated explanation was sought.

Paul Lazarsfeld, Bernard Berelson, and Hazel Gaudet analysed the voters' decision-making processes during a 1940 presidential election campaign and published their results in a paper called The People's Choice. Their findings suggested that the information does not flow directly from the text into the minds of its audience unmediated but is filtered through "opinion leaders" who then communicate it to their less active associates, over whom they have influence. The audience then mediate the information received directly from the media with the ideas and thoughts expressed by the opinion leaders, thus being influenced not by a direct process, but by a two step flow. This diminished the power of the media in the eyes of researchers, and caused them to conclude that social factors were also important in the way in which audiences interpreted texts. This is sometimes referred to as the limited effects paradigm.