Dr. Johannes Ziegler (Prager), M.Sc.

Research Interests

• ecological and psychological determinants of judgment and decision making
• applied methodology and replication science

Education

• 2022: Doctoral Dissertation, Heidelberg University
• 2014 – 2016: M.Sc. Psychology (Cognitive & Clinical Psychology), University of Mannheim
• 2011 – 2014: B.Sc. Psychology, University of Mannheim

Academic Experience

• 2022 – present: Research Assistant, Ludwig Maximilians University (LMU) Munich, Department Psychology (PI: Prof. Dr. Mario Gollwitzer)
• 2016 – 2022: Research Assistant, Heidelberg University, Psychology Institute (PI: Prof. Dr. Klaus Fiedler)
• 2020: Visiting PhD Student, Universitat Pompeu Fabra Barcelona, Department of Economics and Business (host: Prof. Dr. Gaël Le Mens)

Publications

• Ziegler, J., & Fiedler, K. (in press). Small Sample Size and Group Homogeneity: A Crucial Ingredient to Inter-Group Bias. Personality & Social Psychology Bulletin. https://doi.org/10.1177/01461672231223335
• Gollwitzer M, Prager J. (in press) Getting lost in an infinite design space is no solution. Behavioral and Brain Sciences. https://doi.org/10.1017/S0140525X23002236
• Gollwitzer, M., Prager, J., Altenmüller, M. S., & Zein, R. A. (2023). Simplification is Not Indoctrination. Psychology Learning & Teaching, 22(3), 245-250. https://doi.org/10.1177/14757257231195352
• Fiedler, K., Prager, J., & McCaughey, L. (2023). Metacognitive Myopia: A major obstacle on the way to rationality. Current Directions in Psychological Science, 32(1), 49–56. https://doi.org/10.1177/09637214221126906
• Fiedler, K., Salmen, K., & Prager, J. (2022). Toward stronger tests of rationality claims: Spotlight on the rule of succession. Decision, 9(3), 195–211. https://doi.org/10.1037/dec0000167
• Prager, J., & Fiedler, K. (2021). Forming impressions from self-truncated samples of traits – Interplay of Thurstonian and Brunswikian sampling effects. Journal of Personality and Social Psychology, 121(3), 474–497. https://doi.org/10.1037/pspa0000274.supp
• Fiedler, K., McCaughey, L., & Prager, J. (2021). Quo vadis, methodology? The key role of manipulation checks for validity control and quality of science. Perspectives on Psychological Science, 16(4), 816–826. https://doi.org/10.1177/1745691620970602
• Fiedler, K., McCaughey, L., Prager, J., Eichberger, J., & Schnell, K. (2021). Speed-accuracy trade-offs in sample-based decisions. Journal of Experimental Psychology: General, 150(6), 1203–1224. https://doi.org/10.1037/xge0000986
• Prager, J., Krueger, J. I., & Fiedler, K. (2018). Towards a deeper understanding of impression formation – New insights gained from a cognitive-ecological perspective. Journal of Personality and Social Psychology, 115(3), 379–397. https://doi.org/10.1037/pspa0000123
• Fiedler, K., & Prager, J. (2018). The regression trap and other pitfalls of replication science – Illustrated by the report of the Open Science Collaboration. Basic and Applied Social Psychology, 40(3), 115–124. https://doi.org/10.1080/01973533.2017.1421953