For thousands of years, people have closely associated moral cleanliness with acts of physical cleanliness. A recent study published in the Australian Journal of Psychology explored this association by eliciting guilt, a threat to one’s moral purity.

In the study, guilt was elicited by asking participants to remember personal actions that resulted in harm to others and that had yet to be repaired. Participants were then shown threat words intermixed with negative, positive, and neutral words followed by a surprise recall test. Participants were also asked to select a parting gift from several products or rate the desirability of such products. These included cleansing items (hand sanitizer and mouthwash) and merchandise neutral to the concept of cleansing (pencil and notepad).

Heartfelt guilt led to elevated arousal, enhanced memory of threat words, and biased preferences towards cleansing products.

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