We conducted a preregistered multilaboratory project ( k = 36; N = 3,531) to assess the size and robustness of ego-depletion effects using a novel replication method, termed the paradigmatic replication approach. Each laboratory implemented one of two procedures that was intended to manipulate self-control and tested performance on a subsequent measure of self-control. Confirmatory tests found a nonsignificant result ( d = 0.06). Confirmatory Bayesian meta-analyses using an informed-prior hypothesis (δ = 0.30, SD = 0.15) found that the data were 4 times more likely under the null than the alternative hypothesis. Hence, preregistered analyses did not find evidence for a depletion effect. Exploratory analyses on the full sample (i.e., ignoring exclusion criteria) found a statistically significant effect ( d = 0.08); Bayesian analyses showed that the data were about equally likely under the null and informed-prior hypotheses. Exploratory moderator tests suggested that the depletion effect was larger for participants who reported more fatigue but was not moderated by trait self-control, willpower beliefs, or action orientation.

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Sometimes even dieters with the best self-control overindulge. Uncertain situations may undermine the self-control of even well-controlled eaters. This study was designed to test the hypothesis that uncertainty increases unhealthy snacking. Participants were either told that they would be giving a speech, that they would be listening to a speech, or that they would find out later whether they were to give a speech or not. Among participants who typically reported good control over their eating or scored low on emotional eating, participants who were uncertain about whether they would be giving a speech ate more candy than participants who expected to not have to give a speech and even those who expected to have to give a speech. Participants who reported poor control over their eating or scored high on emotional eating did not eat significantly more when uncertain. These findings suggest that, for people who are typically able to control their eating, uncertainty increases snacking more than certainty of a negative outcome.

Courses including lab- or experiential-based learning may shy away from an online lab format. Using an empirically driven approach, an online research methods in psychology lab section was developed and compared to a face-to-face lab section. Results indicated that there were no differences in student knowledge regarding the American Psychological Association style and in the quality of the term papers (as evaluated by independent coders). Although students did not know whether they would be in a face-to-face or online lab when they enrolled, at the end of the semester, students expressed a preference for the style of lab in which they were enrolled. Recommendations for presenting labs or experiential learning content in an online format are discussed.

The rational choice model presumes that individuals are rational and make optimizing decisions based on available information. Theory suggests that lack of information and risk (and risk perceptions) can alter decisions from the static perfect information case, but do not necessarily result in irrational decisions. Stress is another factor that may alter our perceptions and increase cognitive loading (increase the cost) of decision-making. Here, we use an experiment to induce stress and employ a simple ultimatum bargaining game to determine whether stress impacts economic decisions. Our results indicate that those exposed to stress (psychological, uncertainty or physiological, cold pressor task) significantly lower their gains (become less aggressive in bidding) than the control group. These results suggest that stress does, in fact, change behavior and leads to "hedging" behavior that lowers overall gains but increases the probability of success.