People

Hadar

Hadar Naftalovich

Postdoctoral Fellow

I am a Postdoctoral Fellow in the Social Decision Making Lab at the Hebrew University Business School and the Hebrew University Faculty of Medicine under the co-supervision of Shoham Chosen-Hillel and Alex Gileles-Hillel. My postdoctoral research will focus on the impact of war on civilian sleep schedules and how disrupted sleep impacts empathy.

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yair_nahari

Yair Nahari

PhD Student

I am a doctoral student at the Hebrew University Business School and the Federmann Center for the Study of Rationality, both at the Hebrew University of Jerusalem.

I hold a bachelor's degree in Cognitive & Brain Sciences and Psychology, as well as a master's degree in Cognitive Science, all from the Hebrew University.

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Mika Guzikevits

PhD Student

I am a social psychologist and Ph.D. candidate at the Hebrew University Business School and the Federmann Center for the Study of Rationality, supervised by Shoham Choshen-Hillel. I received my B.A. in Psychology and Business Management, my M.A. in Social Psychology, and my M.B.A., all from the Hebrew University of Jerusalem. 

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Shoham Choshen-Hillel

I am an associate professor of organizational behavior at the Hebrew University Business School and the Federmann Center for the Study of Rationality at the Hebrew University. I serve as an associate editor at Management Science and as the vice dean for teaching affairs at the Hebrew University Business School.

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I am the proud director of the “Decision making lab” at the Hebrew University.

I completed my PhD in social psychology in 2013 at the Hebrew University. I have been a visiting scholar (2022-2023) and a postdoctoral fellow (2013-2105) at the Roman Family Center for Decision Research at Booth School of Business, University of Chicago.

Hadar Naftalovich

Hadar
Hadar
Naftalovich
Postdoctoral Fellow

I am a Postdoctoral Fellow in the Social Decision Making Lab at the Hebrew University Business School and the Hebrew University Faculty of Medicine under the co-supervision of Shoham Chosen-Hillel and Alex Gileles-Hillel. My postdoctoral research will focus on the impact of war on civilian sleep schedules and how disrupted sleep impacts empathy.

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I received my Ph.D. and my M.A. in Clinical Psychology from the Hebrew University of Jerusalem, and my B.A. in psychology and visual arts from Emory University.

My research focuses on bettering our understanding of how psychopathological symptoms fluctuate and the potential mechanisms that may underlie these fluctuations. Specifically, my research has focused on how chronotype (whether you are an early bird, a night owl, or somewhere in between), sleep, and inhibition predict symptom fluctuations in individuals with obsessive-compulsive disorder. I explore the hypothesis that symptoms are less severe during optimal times of day based on chronotype (e.g., morning for morning types) and that the mechanism behind this is improved alertness which leads to better inhibitory control. 

Yair Nahari

yair_nahari
Yair
Nahari
PhD Student

I am a doctoral student at the Hebrew University Business School and the Federmann Center for the Study of Rationality, both at the Hebrew University of Jerusalem.

I hold a bachelor's degree in Cognitive & Brain Sciences and Psychology, as well as a master's degree in Cognitive Science, all from the Hebrew University.

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I am conducting my doctoral research under the mentorship of Prof. Shoham Choshen-Hillel and Prof. Ilan Yaniv. My research examines how people assess the overall harms or benefits to groups and how these evaluations shape policy decisions and perceptions of inequality. I am also interested in the balance between efficiency and equality in resource allocation, exploring solutions to these trade-offs and their limitations.

Publications

Choshen-Hillel, S., & Nahari, Y. (2024) The Dilemma of Dividing Five Candies Between Two Children. Frontiers for Young Minds, 11:1286330, 1-7. doi.org/10.3389/frym.2023.1286330

Mika Guzikevits

mika_guzikevits
Mika
Guzikevits
PhD Student

I am a social psychologist and Ph.D. candidate at the Hebrew University Business School and the Federmann Center for the Study of Rationality, supervised by Shoham Choshen-Hillel. I received my B.A. in Psychology and Business Management, my M.A. in Social Psychology, and my M.B.A., all from the Hebrew University of Jerusalem. 

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My research focuses on the social aspects of dishonest behavior, particularly how social image—how we are perceived and judged by others—affects different types of lies. I am also deeply interested in healthcare-related decision-making and the biases that influence these processes. 

In addition to my research, I teach Organizational Behavior to B.A. and M.B.A. students at the Hebrew University. 

Selected Publications 

- Guzikevits, M., Gordon-Hecker, T., Rechtman, D., Salameh, S., Israel, S., Shayo, M., Gozal, D., Perry, A., Gileles, A., & Choshen-Hillel, S. (2024). Sex bias in pain management decisions. Proceedings of the National Academy of Sciences, 121(33), e2401331121. 

- Guzikevits, M., & Choshen-Hillel, S. (2022). The optics of lying: How pursuing an honest social image shapes dishonest behavior. Current Opinion in Psychology, 101384. 

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Dr. Uri Zak

Former postdoctoral fellow

These days, I am a postdoc/lecturer at The Wharton School at the University of Pennsylvania. I received my Ph.D. from the Hebrew University. After living for 14 years in Jerusalem, living in Philadelphia is a significant change!

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I am interested in questions such as: When is it better to be a big fish in a small pond versus a small fish in a big pond? How does location affect performance in competitions? Do we take risks differently when expected to win versus lose a competitive interaction? What drives people to quit from a competitive endeavor?

I love the fact that my work involves asking questions! I am also excited about statistics and methods.

Visit my Google Scholar page, and feel free to reach out! 

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Dr. Tom Gordon-Hecker

Former postdoctoral fellow

I am a lecturer (assistant professor) and the Gabriel and Angel Tamman career development chair in management at the Guilford Glazer faculty of business and management at Ben-Gurion University of the Negev.

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I received my Ph.D. in social psychology from Ben-Gurion university at 2020, and was a postdoctoral fellow under the supervision of Shoham Choshen-Hillel and Anat Perry at the Hebrew University in 2020-2021. My research deals with judgement and decision making, with particular interest in topics at the intersection of psychology, management, and economics

I use experimental methods, economic games, analysis of real-world data and physiological methods intended to study the processes underlying the decisions people make such as eye tracking and mouse tracking, to study pro-social behavior. I have a specific interest in the personal and contextual factors that shape people’s pro-sociality, and focus mainly on fairness, empathy and altruism.

 

Selected publications

Guzikevitch, M. †, Gordon-Hecker, T. †, Rechtman, D., Israel, S., Shayo, M., Perry, A., Gileles-Hillel, A. & Choshen-Hillel, S. (2024). Sex Bias in Pain Management Decisions. Proceedings of the National Academy of Sciences, 121(33), e2401331121. 
† denotes shared first authorship

Gordon-Hecker, T., Yaniv, I., Perry, A., & Choshen-Hillel, S. (2024). Empathy for the pain of others: Sensitivity to the individual, not to the collective. Journal of Experimental Social Psychology, 110, 104561.

Gordon-Hecker, T., & Kogut, T. (2023). Think of what really matters: Structured analysis of personal criteria can save lives. Social Psychological and Personality Science, 14, 891-899. 

Choshen-Hillel, S.†, Sedres, I.†, Gordon-Hecker, T.†, … Perry, A. & Gileles-Hillel, A. (2022). Physicians prescribe fewer analgesics during night shifts than day shifts. Proceedings of the National Academy of Sciences, 119, e2200047119.
† denotes shared first authorship

Gordon-Hecker, T., Rosensaft-Eshel, D., Pittarello, A., Shalvi, S., & Bereby-Meyer, Y. (2017). Not Taking Responsibility: Equity trumps efficiency in allocation decisions. Journal of Experimental Psychology: General 146(6), 771-775. 

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Ariel Bashan Meisel

Former MBA student

I hold a B.A. in Psychology and Business Management, as well as an M.B.A. from the Hebrew University of Jerusalem. My academic research focused on the effects of night shifts on the decision-making processes of 911 call takers, contributing to a broader examination of how sleep deprivation impacts empathy.

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This research was conducted under the mentorship of Prof. Shoham Choshen-Hillel and Dr. Sarit Weisburd

Currently, I work as a Product Marketing Manager, leveraging my research background to create and integrate business value across the initiatives I lead.

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Maya Enisman

Dr. Maya Enisman

Former PhD student

I am a Postdoctoral Fellow in the Social Action Lab at the University of Pennsylvania, with joint appointments in the Annenberg School for Communication and the Department of Psychology in the School of Arts and Sciences.

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I received my Ph.D. in Social Psychology from the Hebrew University of Jerusalem in 2024, where I investigated the differences between conflicts involving desirable alternatives (Approach-Approach conflicts) and those involving undesirable alternatives (Avoidance-Avoidance conflicts).

Together with Prof. Shoham Choshen-Hillel and Prof. Ilan Yaniv, I study advice-based decision-making. Decision-makers are generally considered oblivious to the potential benefits of equally weighting different opinions. We suggest that this misappreciation of averaging is rooted in the decision-makers’ social role: Actors (decision-makers) and observers (people who observe the actors’ behaviors) approach the task of combining information differently. We show that actors value their own opinions, whereas observers value giving unbiased weights to all opinions, displaying an implicit understanding of the benefit of advisory opinions.

 

Selected Publications 

- Enisman, M., & Levy, A., & Kleiman, T. (2024). Hand movement trajectories illustrate the mechanism underlying Kurt Lewin’s distinction between approach-approach and avoidance-avoidance motivational conflictsJournal of Personality and Social Psychology, 127(2), 239–258.

- Enisman, M., & Kleiman, T. (2024). Considering motivational conflicts in context: The relative difficulty of Approach-Approach and Avoidance-Avoidance conflicts is affective context-dependent. Emotion, 24(6), 1358–1375. 

- Enisman, M., Shpitzer, H., & Kleiman, T. (2021). Choice changes preferences, not merely reflects them: A meta-analysis of the artifact-free free-choice paradigm. Journal of Personality and Social Psychology, 120(1), 16–29.

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