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Omission bias is people's tendency to evaluate harm done through omission as less morally wrong and less blameworthy than commission when there is harm. However, findings are inconsistent. We conducted a preregistered meta-analysis, with 21 samples (13 articles, 49 effects) on omission-commission asymmetries in judgments and decisions. We found an overall effect of g = 0.45, 95% confidence interval (CI) = [0.14, 0.77], with stronger effects for morality and blame than for decisions. Publication bias tests produced mixed results with some indication for publication bias, though effects persisted even after most publication bias adjustments. The small sample of studies included limited our ability to draw definite conclusions regarding moderators, with inconclusive findings when applying different models. After compensating for low power, we found indication for moderation by role responsibility, perspective (self vs. others), outcome type, and study design. We hope this meta-analysis will inspire research on this phenomenon and applications to real-life, especially given the raging pandemic. Materials, data, and code are available on https://osf.io/9fcqm/. [ABSTRACT FROM AUTHOR]

Omission bias is the preference for harm caused through omissions over harm caused through commissions. In a pre-registered experiment (N = 313), we successfully replicated an experiment from Spranca, Minsk, and Baron (1991), considered a classic demonstration of the omission bias, examining generalizability to a between-subject design with extensions examining causality, intent, and regret. Participants in the harm through commission condition(s) rated harm as more immoral and attributed higher responsibility compared to participants in the harm through omission condition (d = 0.45 to 0.47 and d = 0.40 to 0.53). An omission-commission asymmetry was also found for perceptions of causality and intent, in that commissions were attributed stronger action-outcome links and higher intentionality (d = 0.21 to 0.58). The effect for regret was opposite from the classic findings on the action-effect, with higher regret for inaction over action (d = −0.26 to −0.19). Overall, higher perceived causality and intent were associated with higher attributed immorality and responsibility, and with lower perceived regret. All materials are available on: https://osf.io/9gsqe/ [ABSTRACT FROM AUTHOR]