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Anaïs Osmont



Ph.D student & Post-doc

Paris Descartes University

Co-supervised by Mathieu Cassotti & Sylvain Moutier

Abstract :

In order to account for the characteristics of risk-taking specific to adolescence, new neurocognitive models
presuppose a competition between two systems with distinct developmental trajectories: an emotional system and a top- down control system. Indeed, heightened risk-taking in adolescence could result from increased emotional sensitivity in socio-emotional contexts, including the presence of peers, combined with immature control processes underlying emotional regulation. Unfortunately, these models ignore the potential impact of varying levels of uncertainty in risky situations, despite advances in developmental psychology that suggest adolescent’s capacities differ between risky decision-making and decision-making under ambiguity. Although adolescents are fully competent at evaluating probabilities and entertaining outcome likelihoods, they fail to make advantageous choices when such information is not directly available but must be inferred from their own experience. Thus, the overall aim of this thesis is to examine the impact of both the information level regarding risks and of the social-emotional context on risk-taking during adolescence.
After showing in a first study that adults are largely ambiguity-averse in situations in which information is missing, we investigated the exact developmental trajectory of such ambiguity aversion in children, adolescents and adults. This second study characterizes ambiguity aversion as an affective strategy that gradually develops at the beginning of adolescence, while demonstrating that adolescents display an ambiguity aversion as much as adults. Then, study 3 aimed to clarify the influence of information level on adolescents’ risk-taking behaviors by directly comparing informed and uninformed situations. Results showed that adolescents exhibit a suboptimal ability to adjust risk-taking to the risk level in the non-informed condition, but are efficient in making advantageous choices when explicit information is provided. Taken together, the first three studies suggest that heightened risk-taking in adolescence does not result from an increased ambiguity tolerance but rather from a specific impairment of feedback-based learning. Given adolescents’ learning impairments in ambiguous situations, study 4 aimed to specify the impact of cautious or risky social influence on risk- taking behaviors, depending on the level of uncertainty. This final study underlies the potential positive influence of peers on risky behaviors. Peers’ experiences could play a particular role by providing social information that is likely to balance the difficulties adolescents have learning from their own experience.

Keywords: Adolescence, Risk-taking, Risky decision-making, Decision-making under ambiguity, Uncertainty level, Ambiguity aversion, Social information, Peers influence.


Osmont, A., & Cassotti, M. (2023). Development of Ambiguity Aversion from Early Adolescence to Adulthood: New Insights from the Ellsberg Paradox. International Journal of Behavioral Development, 47(1), 47–58.

Camarda, A., Bouhours, L., Osmont, A., Le Masson, P., Weil, B., Borst, G., & Cassotti, M. (2021). Opposite effect of social evaluation on creative idea generation in early and middle adolescents. Creativity Research Journal, 33(4), 399‑410.

Bouhours*, L., Camarda*, A., Ernst, M., Osmont, A., Borst, G., & Cassotti, M. (2021). How does social evaluation influence Hot and Cool inhibitory control in adolescence? Plos one, 16(9), e0257753.


Osmont, A., Camarda, A., Habib, M., & Cassotti, M. (2021). Peers' Choices Influence Adolescent Risk‐taking Especially When Explicit Risk Information is Lacking. Journal of research on adolescence, 31(2), 402-416.


Aïte, A., Cassotti, M., Linzarini, A., Osmont, A., Houdé, O., & Borst, G. (2018). Adolescents’ inhibitory control: keep it cool or lose control. Developmental Science, 21, e12491.

Osmont, A., Moutier, S., Simon, G., Bouhours, L., Houdé, O., & Cassotti, M. (2017). How Does Explicit Versus Implicit Risk Information Influence Adolescent Risk‐Taking Engagement?. Journal of Behavioral Decision Making, 30(5), 1093-1103.


Osmont, A., (2015). Prise de Risque à l’Adolescence : L’influence du niveau d’incertitude et du contexte socio-émotionnel [Doctoral dissertation]


Osmont, A*., Cassotti, M*., Agogué, M., Houdé, O., Moutier, S. (2014). Does ambiguity aversion influence the framing effect during decision making? Psychonomic Bulletin Review, 22, 572-577.

Cassotti, M., Aïte, A., Osmont, A., Houdé, O., Borst, G. (2014). What have we learned about the processes involved in the Iowa Gambling Task (IGT) from developmental studies? Frontiers in Psychology, section Decision Neuroscience, 5, 915. doi: 10.3389/fpsyg.2014.00915

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