Lab Log ------- 2016-03-08 / Session 1 - 12 participants scheduled - 1 no-show that was replaced by a first-year Psychology student recruited from the premises. 2016-03-08 / Session 2 - 12 participants scheduled. - One participant said she made a mistake during the decision: she did not pay attention and let the 10 second timer run out without responding. She asked the experimenters what to do, and we told her to indicate what had happened in the justification question. We assumed a contribution of 0€ when calculating the pay-offs. 2016-03-09 / Session 3 - 12 participants scheduled. - 1 cancelled and was replaced by a young graduate researcher (trained in Biology) recruited from the premises. - 1 no-show, replaced by a student - The records of 1 participant showed no response to the decision question (but a complete survey otherwise) - at the end of the session, we asked the participant if she noticed missing any response and she said no. Based on the justification for the decision, we infered that she wanted to donate 0€ and thus did not move the slider at all. When this happens, Qualtrics does not record the numeric value of the slider (because there was no mouse-click). However, given the justification it is clear that the participant intended to contribute 0€. 2016-03-14 / Session 4 - 12 participants scheduled - One participant accidentally restarted the protocol. This happened during the instructions (before the decision slide) so we colelcted the responses of this second run. 2016-03-15 / Session 5 - 12 participants scheduled. 2016-03-16 / Session 6 - 12 participants scheduled. 2016-03-18 / Session 7 - 12 participants scheduled. - One of the computers was disabled. It was replaced by a laptop placed in the same position. 2016-04-11 / Session 8 - 12 participants scheduled. 2016-04-11 / Session 9 - 12 participants scheduled. 2016-04-13 / Session 10 - 12 participants scheduled. 2016-04-13 / Session 11 - 12 participants scheduled. 2016-04-15 / Session 12 - 12 participants scheduled. - One of the computers was disabled. It was replaced by a laptop placed in the same position. Gender proportion assessment after collecting about 80% of the data: - Female: 73% - Male: 27% - Decision: given that gender proportions are within the range defined in the protocol, it is not necessary to adjust participant recruitment. 2016-04-20 / Session 13 - 12 participants scheduled. - One of the computers was disabled. It was replaced by a laptop placed in the same position. 2016-04-20 / Session 14 - 12 participants scheduled. - One of the computers was disabled. It was replaced by a laptop placed in the same position. 2016-04-27 / Session 15 - 12 participants scheduled but only 8 tested due to cancellations. - 1 participant did not finish the task. 2016-04-27 / Session 16 - 12 participants scheduled but only 8 tested due to cancellations. - 1 participant interrupted the survey before completing it. Gender proportion assessment after collecting 100% of the data (without exclusions): - Female: 67.3% - Male: 32.1% - Missing values: 0.5% Exclusions: - Age >= 35 (i.e., yearborn =< 1981) [n=9] - Nationality not Portuguese or Brasilian [n=1] - Incomplete surveys [n=3] - Missing response in the force/timed decision was analysed on a case-by-case basis: if participants indicated that they chose the value of 0€ as their contributions, then their responses were accepted (this examination was done without consulting the experimental conditions of the participants in question). In most cases participants declared (in the justification) that they wanted to contribute 0€ and these values were imputed in the database; in one case the participant explained that she did not respond by accident, and thus this case was excluded. - Number of exclusions: 13 After exclusions, one researcher (TOP) examined the database to assess if our sample had reached the minimal required size (75) per condition and this was the case, meaning we had achieved the conditions specified in our stopping rule. Gender proportion assessment after exclusions (N=171): - Female: 67.8% - Male: 32.2%