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Joshua R. de Leeuw Assistant Professor of Cognitive Science

Josh de Leeuw received his PhD in Cognitive Science and Psychological and Brain Sciences from Indiana University in 2016. He received his BA from Vassar College in 2008, majoring in Cognitive Science.

Josh's research is focused on the development and application of Internet-based tools for the study of human cognition. He created the widely-used jsPsych experiment software for conducting behavioral experiments online. He uses these tools to study how people learn and represent new information. 

  • BA, Vassar College; PhD, Indiana University
  • At Vassar since 2016


Research and Academic Interests

  • Computational Modeling
  • Data Science
  • Online Experiments
  • Perception
  • Learning

Departments and Programs


  • COGS 100. Introduction to Cognitive Science
  • COGS 219. Research Methods in Cognitive Science
  • COGS 220. Autonomous Robotics Design Competition
  • COGS 311. Seminar in Cognitive Science
  • COGS 319. Modeling Minds, Brains, and Behavior

Selected Publications

Motz, B.A., de Leeuw, J.R., Carvalho, P.F., Liang, K.L., & Goldstone, R.L. (2017). A dissociation between engagement and learning: Enthusiastic instructions fail to reliably improve performance on a memory task. PLoS ONE, 12(7): e0181775. doi: 10.1371/journal.pone.0181775.

Goldstone, R.L., de Leeuw, J.R. and Landy, D.H. (2016) Carving nature at its joints or cutting its effective loops? On the dangers of trying to disentangle intertwined mental processes. Behavioral and Brain Sciences, 39. doi:10.1017/S0140525X1500271X

de Leeuw, J. R., Andrews. J. K., Livingston, K. R., & Chin., B. M. (2016). The effects of categorization on perceptual judgment are robust across different assessment tasks. Collabra: Psychology, 2(1), 9. doi:10.1525/collabra.32

Carvalho, P., Braithwaite, D., de Leeuw, J. R., Motz, B., & Goldstone, R. L. (2016). An in-vivo study of self-regulated study sequencing in introductory psychology courses. PLoS ONE, 11(3): e0152115. doi:10.1371/journal.pone.0152115

de Leeuw, J. R., & Motz, B. A. (2016). Psychophysics in a web browser? Comparing response times collected with JavaScript and Psychophysics Toolbox in a visual search task. Behavior Research Methods, 48(1), 1-12. doi:10.3758/s13428-015-0567-2

Goldstone, R. L., de Leeuw, J. R., & Landy, D. H. (2015). Fitting perception in and to cognition. Cognition, 135, 24-29. doi:10.1016/j.cognition.2014.11.027

de Leeuw, J. R. (2015). jsPsych: A JavaScript library for creating behavioral experiments in a Web browser. Behavior Research Methods, 47(1), 1-12. doi:10.3758/s13428-014-0458-y


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