The term refers to a social consequence of mass media. The theory claims that as news about an issue inundates people, they become apathetic to it, substituting action on that issue for knowing about it.
Because the individual is assailed with information of issues and problems and they are knowledgeable about or discuss these issues, they believe they are helping in the solution. Society has confused knowing about an issue with doing something about it. Society’s conscience is clear as they think they have done something to remediate the issue. However, being informed and concerned is not a replacement for action.
Even though there are increasing numbers of political messages, information, and advertisements, political participation continues to decline. People pay close attention to the media, but there is an overexposure of messages that can get confusing and contradictory so people don’t get involved in the political process.
Research on understanding media effects have gone through 3 phases during the 20th century. From the 1920s to 1940s researchers believed the media had a powerful effect on its audience. This assumes the audience is passive and uncritical of the media’s messages. This phase is characterized by the Hypodermic needle model or Bullet Theory. This theory was used to explain how WWII propaganda changed behavior – convincing men to join the service, housewives to change food habits, and improving the morale of new soldiers.
From the 1940s through the 1960s, researchers believed that people were more influenced by their friends and family than the media. The minimalist effects theory includes narcotizing dysfunction because the audience withdraws from real issues and becomes passive. In this phase instead of the media telling people what to think, it tells the audience what to think about (sets the agenda).
From the 1960s to today, researchers believe that the media can have both powerful and limited effects on society, depending on situational factors. The media may impact the development of attitudes, beliefs, and values, and it may be more influential on some personalities than others.
Popular culture 
- Baran et al. pp.179-80 quotation:
one of the first media effects to be studied in some depth using functional analysis was the narcotizing dysfunction, the idea that as news about an issue inundates people, they become apathetic to it... These findings were disturbing because they suggested that even when media are effective at surveying the environment and calling attention to societal problems (a manifest function), ... media coverage might "narcotize" [the public] so that they become apathetic and decide that they are powerless to do anything (a latent dysfunction).
- Baran, S.;Davis, D: Mass Communication Theory (fifth edition) (Wadsworth, 2009).