This excel file contains: i) the numerical data resulting from the participants’ performance in each of the administered tasks, and ii) the participants’ responses to the post-experimental questions. In the excel file, the column headings are self-explanatory, provided you also have the corresponding publication given above as a reference (How to guard against fixation? Demonstrating individual vulnerability is more effective than warning of general risk). The data were collected from April to June 2019 from 109 participants recruited through the online platform Amazon Mechanical Turk. Participants’ age range between 18 and 30 years. They had different levels of education and were studying various disciplines. Participants completed the study individually and received $5 in return of their participation. The study was approved by the local Ethical Committee. Participants gave their consent electronically before starting with the study.