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Media layering, the simultaneous use of multiple unrelated media sources, has been documented as an increasing behavior trend (Roberts, Foehr, & Rideout, 2005) that marks a qualitative and quantitative difference in the way media is experienced. Presently, the impact on consumers from media layering is unknown. A strong theoretical foundation of human information processing theory predicts negative consequences in terms of performance cost in learning, and degradation of attention. Related research on dual task performance and multiple-channel processing demonstrates a decline in performance. This study compared sustained attention performance on a cancellation task, the d2 Test of Attention (Brickenkamp & Zillmer, 1998), in four varying media conditions. Performance scores were evaluated to determine the effect of degrees of extraneous media saturation and media interaction on attention task performance. / Ed. D.

The diploma thesis named "Do we need more information? Using of multiple media at the same time" examines the phenomen of simultaneous media usage in young audience aged 18-35 years. This thesis is based on the hypotheses of international surveys that demonstrate a new trend in consumption of media by which people use multiple media simultaneously. The aim of the thesis is to provide an insight into this issue. The first part defines basic concepts such as the media, media audience and related theories. Furthermore, international studies and their conclusions are presented, serving as a starting point for my own research. The second part presents the research methodology. The thesis makes use of a combination of a quantitative and qualitative approach, the so-called mixed research. The methodological section briefly describes the selected method - survey and an semi-structured interview. The next two sections deal with the implementation of the research itself. The sample consisted of 103 young people for the quantitative part of the survey, and 15 young people for the qualitative analysis section. The conclusion summarizes the research results and approaches each thematic area, including the possible hypotheses.