Various forms of news use not only have independent impacts on political knowledge, but also create interactive effects across different types of news outlets. In the present study, data from 2 surveys conducted in 2004 were used to test hypotheses about the contingent effects of news media use on political knowledge. The results supported the intramedia interaction hypothesis regarding use of multiple similar (in terms of content and form) news outlets. For instance, use of both cable news and network news produces diminishing returns. But, when print news is used in combination with audio–visual news sources, patterns of additive effects were observed.
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Shen et al. (2010) studied this question.
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