https://johannesjohansson.com/tags/longitudinal-dynamics/Longitudinal DynamicsHugoBlox Kit (https://hugoblox.com)enWed, 27 May 2026 00:00:00 +0000https://johannesjohansson.com/media/icon_hu_1151ae2ce54243dc.pnghttps://johannesjohansson.com/tags/longitudinal-dynamics/https://johannesjohansson.com/projects/media-effects-in-motion/Wed, 27 May 2026 00:00:00 +0000https://johannesjohansson.com/projects/media-effects-in-motion/<p>This, my PhD dissertation project, develops a process-oriented account of media effects, focusing on how media influence unfolds over time through the interaction between exposure, content, and citizens’ evolving cognitive schemas. Rather than treating agenda-setting and framing as separate or competing perspectives, the dissertation integrates them within a broader theory of schema development: media can shape which attributes become salient, how those attributes are interpreted, and whether new information is assimilated, resisted, or contributes to deeper cognitive change. This perspective highlights media effects as recursive and temporally conditioned processes, where influence may be strongest when issues are novel, unstable, or reactivated, while later stability may reflect earlier effects embedded in consolidated beliefs.</p> <p>Empirically, the dissertation consists of four original studies. The first examines stability and change in news consumption repertoires; the second investigates how news frames evolve, interact, and compete over time; the third links dynamic media content to a five-wave panel survey to study long-term agenda-setting and schema development during the COVID-19 pandemic; and the fourth uses framing experiments to test mechanisms of assimilation and accommodation under varying conditions of content, repetition, sentiment, and issue type. Together, the studies combine longitudinal panel data, experimental designs, manual content analysis, and computational text analysis to explain how media effects vary across time, contexts, individuals, and stages of belief formation.</p> <h2 id="included-publications">Included publications</h2> <ul> <li><strong>K. Andersen, J. Johansson, B. Johansson, &amp; A. Shehata (2022).</strong> . <em>Journalism &amp; Mass Communication Quarterly, 99</em>(1), 237–261.</li> <li><strong>J. Johansson (2026).</strong> <em>Frames in Thought and Schema Development: Hidden Sources of Stability and Change via Frame Content.</em> ICA 2025.</li> <li><strong>J. Johansson (2026).</strong> . ICA 2022; In review.</li> <li><strong>J. Johansson (2026).</strong> . ICA 2021.</li> </ul>