This is the project page for a series of experiments on how risk in effort influences choices. The experiments have been organized into two manuscripts and therefore two folders. 1) **Exprienced-Based Effort** This relates to work published in the following paper: Mason, A., Madan, C. R., Freas, C. A., Simonsen, N., Ludvig, E. A., & Spetch, M. L. (2022). Risky choice and memory for effort: Hard work stands out. *Decision*. In particular, in one set of experiments (1 and 3), we examine whether extremes in effort space are overweighted in risky choice-similar to how extreme outcomes are overweighted with outcomes (see Madan et al., 2019). Here's a full layout of the 5 experiments in the experienced-based series : **Exp 1a**: UAlberta pool. Risky effort from Experience. 1 to 6 circles. (Feb 2019; Abandoned)<br /> **Exp 1b**: UAlberta pool. Risky effort from Experience. 1 to 11 circles. (March 2019) **Exp 3a**: UAlberta Pool. Risky effort paradox from Experience. 1 to 11 circles (Feb 2020)<br /> **Exp 3b**: Prolific. Risky effort paradox from Experience. Unique circles. (Dec 2020) Note that Exp 1a was abandoned partway through as there was an error in the code that led to the wrong trials being presented. Performance on catch trials was so poor (less than 50% correct on average) that rather than fix this version and run it again, that task was abandoned. Experiments 3a was abandoned midway due to the Covid-19 pandemic. A second version (Exp 1b) was devised that fixed these issues with a better trial structure and different levels of effort. 2) **Described Effort** This relates to work published in the following paper: Mason, A., Sun, Y., Simonsen, N., Madan, C., Spetch, M., & Ludvig, E. (In press). Risky Effort. *Cognition*. This contains three main experiments (in the paper) and three pilot experiments (not included). In this series of experiments, we examined how people make choices about described gambles and how their risk preferences differ for money, physical effort and mental effort. **Exp 1** uses a click task **Exp 2** uses an adding task **Exp 3** is a monetary control task.