Willem W.A. Sleegers

Assistant Professor in Social Psychology

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Currently

I’m an Assistant Professor in the Social Psychology department of Tilburg University. I’m interested in false beliefs, physiological measures, and experimental design. I teach courses related to social psychology and the statistical programming language R.


Employment

Academic

2018-current Tenure track Assistant Professor in social psychology at Tilburg University
2016-2018 Fixed term Assistant Professor in social psychology at Tilburg University
2012-2016 Graduate student on the topic of physiological arousal in meaning maintenance
2011-2012 Student assistant during my Research Master: Behavioral Science at Nijmegen University

Non-academic

2012-2013 Programmer of experimental psychology tasks for FrieslandCampina
2007-2010 Media analyst for Report International

Publications

Journals

  • Sleegers, W. W. A., Proulx, T., & van Beest, I. (2019). Confirmation bias and misconceptions: Pupillometric evidence for a confirmation bias in misconceptions feedback. Biological Psychology, 145, 76–83. https://doi.org/:10.1016/j.biopsycho.2019.03.018
  • Bender, M., van Osch, Y., Sleegers, W., & Ye, M. (2019). Social support benefits psychological adjustment of international students: Evidence from a meta-analysis. Journal of Cross-Cultural Psychology. https://doi.org/10.1177/0022022119861151
  • van ’t Veer, A. E., Sleegers, W. W. A. (2019). Psychology data from an exploration of the effect of anticipatory stress on disgust vs. non-disgust related moral judgments. Journal of Psychology Data, 7(1), 1. https://doi.org/10.5334/jopd.43
  • Jaeger, B., Sleegers, W.W.A., Evans, A. M., Stel, M., & van Beest, I. (2018). The effects of facial attractiveness and trustworthiness in online peer-to-peer markets. Journal of Economic Psychology. https://doi.org/10.1016/j.joep.2018.11.004
  • Proulx, T., Sleegers, W.W.A., & Tritt, S. (2017). The expectancy bias: Expectancy-violating faces evoke earlier pupillary dilation than neutral or negative faces. Journal of Experimental Social Psychology, 70, 69-79. https://doi.org/10.1016/j.jesp.2016.12.003
  • Sleegers, W. W. A., Proulx, T., & van Beest, I. (2017). The social pain of Cyberball: Decreased pupillary reactivity to exclusion cues. Journal of Experimental Social Psychology, 69, 187–200. https://doi.org/10.1016/j.jesp.2016.08.004
  • Sleegers, W. W. A., Proulx, T., & van Beest, I. (2015). Extremism reduces conflict arousal and increases values affirmation in response to meaning violations. Biological Psychology, 108, 126–131. https://doi.org/10.1016/j.biopsycho.2015.03.012
  • Sleegers, W. W. A., & Proulx, T. (2015). The comfort of approach: Self-soothing effects of behavioral approach in response to meaning violations. Frontiers in Psychology, 5, 1–10. https://doi.org/10.3389/fpsyg.2014.01568

Book chapters

  • van Beest, I., & Sleegers, W.W.A (Accepted/In press). Physiostracism: A case for non-invasive measures of arousal in ostracism research. In S. C. Rudert, R. Greifeneder, & K. D. Williams (Eds.), Current directions in ostracism, social exclusion and rejection research. Routledge.

Dissertation


Presentations

Invited talks

  • Sleegers, W.W.A. (2018, December). Pupillometry and psychology. Colloquium presentation for the Laboratoire de Psychologie Sociale department at Paris Descartes University.
  • Sleegers, W.W.A. (2018, October) tidystats. Colloquium presentation for the Methodology and Statistics department at Leiden University.
  • Sleegers, W.W.A. (2018, March) tidystats. Colloquium presentation for the MTO department at Tilburg University.
  • Sleegers, W.W.A. (2017, December). Meaning and pupillometry: The role of physiological arousal in meaning maintenance. Presentation at the ASPO conference as part of receiving the best ASPO dissertation award.
  • Sleegers, W.W.A. (2017, March). Pupillometry and psychological processes. Colloquium presentation at Cardiff University.
  • Sleegers, W.W.A., Proulx, T. & Van Beest, I. (2015, October). Capturing the physiological response to meaning violations: An eye tracker approach. Colloquium presentation at Tilburg University.

Conference presentations

  • Sleegers, W.W.A. (2019, July) tidystats. Lightning talk at the SIPS conference, Rotterdam, the Netherlands.
  • Sleegers, W.W.A. (2018, June) tidystats. Lightning talk at the SIPS conference, Grand Rapids, MI.
  • Sleegers, W.W.A. (2017, August). oTree for social scientists. Presentation at the TIBER conference, Tilburg, the Netherlands.
  • Sleegers, W.W.A., Proulx, T. & Van Beest (2016, December). Evidence of aversive arousal motivating compensatory behavior. Presentation at ASPO conference, Leiden, the Netherlands.
  • Proulx, T. & Sleegers, W.W.A. (2014, May). Meaning Maintenance Model: Towards a unified account of threat-compensation behaviors. Presentation at KLI conference, Zeist, the Netherlands.
  • Sleegers, W.W.A., Proulx, T., & Van Beest (2014, December). Cyberball and eye tracking: Support for the numbing hypothesis of social exclusion. Presentation at ASPO 2014, Groningen, the Netherlands.
  • Sleegers, W.W.A., Proulx, T., & Van Beest (2014, July). Ostracism and eye tracking. Presentation at EASP preconference on threat regulation, Amsterdam, the Netherlands.

Poster presentations

  • Sleegers, W.W.A. (2017, July). Pupillometry and psychology: Pupillometry as an experimental tool for psychologists. Poster session presented at the Ostracism, Social Exclusion, and Rejection conference, Vitznau, Switzerland.
  • Sleegers, W.W.A., Proulx, T., & Van Beest (2016, January). Ostracism and eye tracking: Decreased pupillary reactivity to exclusion cues. Poster session presented at the SPSP conference, San Diego.
  • Sleegers, W.W.A., Proulx, T., & Van Beest (2015, December). Meaning and misconceptions: The effect of error feedback and commitment towards misconceptions on pupil size. Poster session presented at ASPO conference, Amsterdam.
  • Sleegers, W.W.A., Proulx, T. & Van Beest (2015, March). Cyberball and eye tracking: Support for the numbing hypothesis of social exclusion. Poster session presented at ICPS conference, Amsterdam, the Netherlands.
  • Sleegers, W.W.A., Proulx, T, & Van Beest, I. (2014, May). Extremism and the response to meaning threats: Extremism reduces pupillary response to threat and increases affirmation of values. Poster session presented at the KLI conference, Zeist, the Netherlands.

Valorization presentations

  • Sleegers, W.W.A. (2019, January). On being wrong. Presentation organized by the Human Library initiative at the LocHal in Tilburg.
  • Sleegers, W.W.A., & Wagemans, F.M.A. (2017, November). The psychology behind eye tracking. Presentation organized by the Academic Forum of Tilburg University.
  • Wagemans, F.M.A., & Sleegers, W.W.A. (2017, June). Waar walg jij van? Presentation at Mundial festival on attentional processes and disgust sensitivity using eye tracking.

Journals

Reviewer

  • Biological Psychology
  • British Journal of Psychology
  • British Journal of Social Psychology
  • European Journal of Social Psychology
  • PLOS ONE
  • Self and Identity
  • Group Processes & Intergroup Relations
  • Behavioural Processes
  • Social Influence
  • International Journal of Psychology
  • Journal of Experimental Social Psychology
  • Behavioural Processes
  • Social Psychology
  • Social Cognition

Awards

Awards are stupid.


Teaching

Courses

2016-2019 Attitudes and Advertising
2017-2019 Social Psychology
2015/’17/’19 Research Master: Experimental Research and Meta-Analysis
2016-2019 Course in R software

Seminars

2012-2017 Social Psychology
2015-2016 Introduction and History of Psychology
2014-2015 Cultural Psychology
2013-2015 Academic Skills
2012-2013 Group Skills

Individual lectures

2016 Social Psychology
2014 Introduction and History of Psychology on intrapersonal conflict
2013 Introduction to Social Psychology for prospective students

Supervision

2016-2019 Master in Psychology theses (20 students)
2013-2019 Bachelor in Psychology theses (13 students)
2012-2018 Research Skills in Psychology (8 groups of students)

Coordination

2014-2019 Social Psychology
2016-2019 Attitudes and Advertising

Workshops

2017 R for psychologists

Other

2013-2019 An introduction to R; part of the Kurt Lewin Institute course program

Department

Lab coordinator of the SP-lab Member of the EXperimental Psychology Lab for Online REsearch (EXPLORE) Organized the Voluntary Research Assistance (VRA) program

Faculty

Member of the Tilburg School of Social and Behavioral Sciences PhD-council from 2014 to 2016

Conferences

ASPO dissertation prize committee member from 2014 to 2015


Skills

Statistics

  • R: A free software environment for statistical computing and graphics
  • SPSS: A proprietary data analysis program

Programming

  • Python: A cross-platform procedural programming language
  • HTML, CSS, JavaScript: Markup language for creating web pages and web applications
  • JavaScript: Programming language for creating web applications

Experimental design

  • Millisecond’s Inquisit: Stimulus delivery and experimental design software
  • oTree: Framework based on Python and Django to create standard and interactive online psychological experiments
  • Tobii Studio and Tobii Studio Extensions for E-prime: software to run eye tracker experiments using Tobii eye trackers
  • Psychology Software Tool’s E-Prime: Stimulus delivery and experimental design software
  • Adobe’s Authorware: Stimulus delivery and experimental design software. This has been discontinued, please do not make me use it
  • Neurobehavioural Systems’ Presentation®: A stimulus delivery and experimental control program for neuroscience

Projects

tidystats

I created an R package called tidystats. tidystats can combine the output of statistical models and save them as a simple text file. Too often important statistical results cannot be retrieved from scientific papers, either due to errors in reporting or due to the great hassle of having to extract them from PDFs. tidystats can be used to easily and reliable report statistical results in a manuscript, as well as share them freely with others.

Personal website

I have my own website at www.willemsleegers.com where I write about my research and offer tutorials on various topics related to my research, such how to prepare eye tracker data. These tutorials mostly consist of the statistical programming language R. The website itself is also created in R.

Github

On my Github page I host several repositories of code that can be useful to fellow academics. This includes code on tidystats, a mouse-tracking implementation in oTree and item-analysis code of multiple-choice exams with R Markdown.