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Here are initial updates to content and citation for the Hypodermic needle model page.

The main theme sentences appear to lack proper citation for statements of fact and need additional information from peer-reviewed and authoritative sources.

The hypodermic needle model (known as the hypodermic-syringe model, transmission-belt model, or magic bullet theory) is a model of communication suggesting that an intended message is directly received and wholly accepted by the receiver.

Recommend re-writing this as:

The hypodermic needle model (known as the hypodermic-syringe model, transmission-belt model, or magic bullet theory) is purported to be a model of communication suggesting that an intended message is directly received and wholly accepted by the receiver. This particular model is still debated in research circles with both advocates and detractors from its accuracy. Advocates for the received view assert that research and theorizing about mass communication have progressed from the powerful media- direct effects model to a limited effects model that emphasizes intervening variables such as cultural background and personal characteristics. Those who dispute this received view argue that the direct effects, or hypodermic, model was never endorsed by early mass communication research, but that it was a theoretical foil invented by those who articulated a limited effects perspective.