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Dr Tomás Lejarraga

Dr Tomás Lejarraga
Senior Lecturer
Business Organization


Brief CV

Tomás is the Director of the UIB Decision Science Laboratory. He received his doctorate in Universitat Pompeu Fabra (Spain) in 2009. He was a Postdoctoral Fellow at the Dynamic Decision Making Laboratory in Carnegie Mellon University (USA), and later a Visiting Associate Professor at the Universitat de les Illes Balears (Spain). From 2013 to 2016, Tomás was a Research Scientist at the Center for Adaptive Rationality in the Max Planck Institute for Human Development in Berlin (Germany). He is interested in how individuals and groups explore, process, and integrate descriptive (symbolic information) and personally experienced information when making decisions. His most recent publications are:

Lejarraga, T., & Hertwig, R. (2021). How Experimental Methods Shaped Views on Human Competence and Rationality. Psychological Bulletin, in press.

Lejarraga, T., & Hertwig, R. (2021). Three Theories of Choice and Their Psychology of Losses. Perspectives on Psychological Science, in press.

Lejarraga, T., Lucena, A. & Rubí-Barceló, A. (2020). Beliefs estimated from choices in Proposer-Responder Games. Journal of Economic Behavior and Organization, in press.

Lejarraga, T. & Lejarraga, J. (2020). Confidence and the Description-Experience Distinction, Organizational Behavior and Human Decision Processes, 161, 201-212.

More information


Office Hours

You need to book a date with the professor in order to attend a tutoring session

Thesis advising

Thesis advisor during the academic year 2022-23 for the following PHD programmes:

Teaching, 5 previous years

Subject Information
20505 - Organisational Design and Human Resources
20531 - Final Degree Project
21222 - Final Degree Project
  • Degree in Business Administration2019-20
  • Double Degree in Business Administration and Tourism2019-20, 2021-22


Research groups

Group Membership type
Decision Science Main researcher
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