We propose another positive illusion that fits with McKay & Dennett's (M&D's) criteria for adaptive misbeliefs. This illusion is pervasive in adult reasoning but we focus on its prevalence in children's developing theories. It is a strongly held conviction arising from normal functioning of the doxastic system that confers adaptive advantage on the individual.

Belief in souls is only one component of supernatural thinking in which individuals infer the presence of invisible mechanisms that explain events as paranormal rather than natural. We believe it is important to place greater emphasis on the prevalence of supernatural beliefs across other domains, if only to counter simplistic divisions between rationality and irrationality recently aligned with the contentious science/religion debate.

In two studies we investigated whether people evidence an effect of moral contamination with respect to hypothetical organ transplants. This was achieved by asking participants to make judgements after presenting either positive or negative background information about the donor. In the first study, positive/negative background information had a corresponding effect on three judgements with attitudes to a heart transplant most pronounced by negative background information relative to good information and controls. This effect was replicated in the second study with both (...) heart and liver transplantation. Negative effects were stronger than positive effects in all conditions consistent with a negativity bias, but again stronger with regards to organs than controls. These results confirm findings from surveys that reveal real patients are concerned about moral contamination following organ transplantation and show that this bias in evident even in hypothetical, non-life-threatening scenarios. In a third study we found a significantly stronger moral contagion effect in Japanese relative to English participants, suggesting that concerns about moral contagion may be moderated by culture. (shrink)