Dr Marie Juanchich

Senior Lecturer
Department of Psychology
Dr Marie Juanchich



I am a behavioral scientist interested in empowering people to make better decisions. For example, I evaluate whether different weather forecast formats reduce weather misinterpretations and how different framing of climate change uncertainty affects decision-making quality and trust. I also conduct some behavioral change research on how to reduce prejudice and discrimination.


  • PhD in Psychology

  • Master's in Psychology University of Toulouse II - Le Mirail,


University of Essex

  • Director of impact, Psychology, University of Essex (1/2/2016 - present)

Research and professional activities

Research interests

Risk communication

Few of us can say for sure what will happen tomorrow, next week or next months, less alone predict what will happen in ten years (as for climate change). Whether events will happen or not is therefore uncertain or *risky* and is often quantified to be communicated (e.g., probabilities in weather forecasts, odds in horse races, intervals in sea rise predictions). I am researching ways to improve the communication of uncertainty and risk to help people to make better-informed decisions. Some of my projects are fairly theoretical (e.g., which vocal cues are used to mark the uncertainty of the speaker?) and some are more applied (e.g., is it better to describe the risk of drugs' adverse side effects in words or numbers?).

Key words: risk communication
Open to supervise

Gender equality

I am interested in testing evidence-based strategies to encourage people to stand up to sexism and reduce misogynist discourse (e.g., online, in magazines).

Key words: equality
Open to supervise


Journal articles (36)

LIU, D., Juanchich, M., Sirota, M. and Orbell, S., The intuitive use of contextual information in decisions made with verbal and numerical quantities. Quarterly Journal of Experimental Psychology

Sirota, M. and Juanchich, M., (2019). Ratio format shapes health decisions: The practical significance of the "1-in-X" effect. Medical Decision Making. 39 (1), 32-40

Juanchich, M. and Sirota, M., (2019). Do people really prefer verbal probabilities?. Psychological Research

Walasek, L., Juanchich, M. and Sirota, M., (2019). Adaptive cooperation in the face of social exclusion. Journal of Experimental Social Psychology. 82, 35-46

Juanchich, M. and Sirota, M., (2019). Not as gloomy as we thought Reassessing how the public understands probability of precipitation forecasts. Journal of Cognitive Psychology. 31 (1), 116-129

Juanchich, M., Sirota, M. and Bonnefon, J-F., (2019). The polite wiggle-room effect in charity donation decisions. Journal of Behavioral Decision Making. 32 (2), 179-193

Liu, D., Juanchich, M., Sirota, M. and Orbell, S., (2019). People Overestimate Verbal Quantities of Nutrients on Nutrition Labels. Food Quality and Preference. 78, 103739-103739

Løhre, E., Juanchich, M., Sirota, M., Teigen, KH. and Shepherd, TG., (2019). Climate scientists’ wide prediction intervals are more likely but perceived to be less certain. Weather, Climate and Society. 11 (3), 565-575

Sirota, M., Juanchich, M., Petrova, D., Garcia-Retamero, R., Walasek, L. and Bhatia, S., (2018). Health professionals prefer to communicate risk-related numerical information using "1-in-X" ratios. Medical Decision Making. 38 (3), 366-376

Juanchich, M., Walasek, L. and Sirota, M., (2018). Decision-makers are resilient in the face of social exclusion. British Journal of Psychology. 109 (3), 604-630

Sirota, M. and Juanchich, M., (2018). Effect of response format on cognitive reflection: Validating a two- and four-option multiple choice question version of the Cognitive Reflection Test. Behavior Research Methods. 50 (6), 2511-2522

Sirota, M., Juanchich, M. and Bonnefon, J-F., (2018). 1-in-X" bias: "1-in-X" format causes overestimation of health-related risks. Journal of Experimental Psychology: Applied. 24 (4), 431-439

Liu, D. and Juanchich, MMG., (2018). Conceptual understanding and quantity inferences: A new framework for examining consumer understanding of food energy.. Public Health Nutrition. 21 (17), 3168-3177

Navarrete, G., Correia, R., Sirota, M., Juanchich, M. and Huepe, D., (2017). Doctor, what does my positive test mean? From Bayesian textbook tasks to personalized risk communication. Frontiers in Psychology. 6, 1327-

Juanchich, MMG., Gourdon-Kanhukamwe, A. and Sirota, M., (2017). “I am uncertain” vs “It is uncertain”. How linguistic markers of the uncertainty source affect uncertainty communication. Judgment and Decision Making. 12 (5), 445-465

Juanchich, MMG. and Sirota, M., (2017). How Much Will the Sea Level Rise? Outcome Selection and Subjective Probability in Climate Change Predictions. Journal of Experimental Psychology: Applied. 23 (4), 386-402

Juanchich, M. and Sirota, M., (2016). How to improve people's interpretation of probabilities of precipitation. Journal of Risk Research. 19 (3), 388-404

Juanchich, M., Dewberry, C., Sirota, M. and Narendran, S., (2016). Cognitive Reflection Predicts Real-Life Decision Outcomes, but Not Over and Above Personality and Decision-Making Styles. Journal of Behavioral Decision Making. 29 (1), 52-59

Sirota, M. and Juanchich, M., (2015). A direct and comprehensive test of two postulates of politeness theory applied to uncertainty communication. Judgment and Decision Making. 10 (3), 232-240

Vall�e-Tourangeau, G., Sirota, M., Juanchich, M. and Vall�e-Tourangeau, F., (2015). Beyond getting the numbers right: what does it mean to be a "successful" Bayesian reasoner?. Frontiers in Psychology. 6 (712), 712-

Sirota, M., Kostovičová, L. and Juanchich, M., (2014). The effect of iconicity of visual displays on statistical reasoning: evidence in favor of the null hypothesis. Psychonomic Bulletin & Review. 21 (4), 961-968

Sirota, M., Juanchich, M., Kostopoulou, O. and Hanak, R., (2014). Decisive Evidence on a Smaller-Than-You-Think Phenomenon. Medical Decision Making. 34 (4), 419-429

Sirota, M., Juanchich, M. and Hagmayer, Y., (2014). Ecological rationality or nested sets? Individual differences in cognitive processing predict Bayesian reasoning. Psychonomic Bulletin & Review. 21 (1), 198-204

Teigen, KH., Juanchich, M. and Filkuková, P., (2014). Verbal Probabilities: An Alternative Approach. Quarterly Journal of Experimental Psychology. 67 (1), 124-146


Dewberry, C., Juanchich, M. and Narendran, S., (2013). Decision-making competence in everyday life: The roles of general cognitive styles, decision-making styles and personality. Personality and Individual Differences. 55 (7), 783-788

Juanchich, M. and Sirota, M., (2013). Do people really say it is “likely” when they believe it is only “possible”? Effect of politeness on risk communication. Quarterly Journal of Experimental Psychology. 66 (7), 1268-1275

Juanchich, M., Halvor Teigen, K. and Gourdon, A., (2013). Top scores are possible, bottom scores are certain (and middle scores are not worth mentioning): A pragmatic view of verbal probabilities. Judgment and Decision Making. 8 (3), 345-364

Juanchich, M., Sirota, M., Karelitz, TM. and Villejoubert, G., (2013). Can membership-functions capture the directionality of verbal probabilities?. Thinking & Reasoning. 19 (2), 231-247

Teigen, KH., Juanchich, M. and Riege, AH., (2013). Improbable outcomes: Infrequent or extraordinary?. Cognition. 127 (1), 119-139

Dewberry, C., Juanchich, M. and Narendran, S., (2013). The latent structure of decision styles. Personality and Individual Differences. 54 (5), 566-571

Sirota, M. and Juanchich, M., (2012). Risk Communication on Shaky Ground. Science. 338 (6112), 1286-1287

Sirota, M. and Juanchich, M., (2012). To what extent do politeness expectations shape risk perception? Even numerical probabilities are under their spell!. Acta Psychologica. 141 (3), 391-399

Juanchich, M., Sirota, M. and Butler, CL., (2012). The perceived functions of linguistic risk quantifiers and their effect on risk, negativity perception and decision making. Organizational Behavior and Human Decision Processes. 118 (1), 72-81

Sirota, M. and Juanchich, M., (2011). Role of numeracy and cognitive reflection in bayesian reasoning with natural frequencies. Studia Psychologica. 53 (2), 151-161

Juanchich, M., Teigen, KH. and Villejoubert, G., (2010). Is guilt ‘likely’ or ‘not certain’?. Acta Psychologica. 135 (3), 267-277

Book chapters (1)

Juanchich, M., Sirota, M. and Bonnefon, J-F., Verbal Uncertainty. In: The Oxford Handbook of Experimental Semantics and Pragmatics. Oxford University Press. 354- 368

Conferences (1)

LIU, D. and Juanchich, M., Want to prime exercise? Calorie labels work better than activity ones!

Grants and funding


Framing with words and numbers: Investigating the effect of verbal or numerical quantifiers on the framing effect

Experimental Psychology Society

Rationally irrational: When people don�t correct errors in their reasoning

Leverhulme Trust


How Professional Supervision Can Best Influence the Quality of Social Work Decisions


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