Lady Macbeth is one of the most complex Shakespeare characters, and most manipulative and obsessive also. She pushed her husband into murdering king Duncan, not being able to suppress her burning thirst for power and wealth. Poor Lady Macbeth repeatedly washes her hand --- even while sleeping, deluding that water could wash the sinful deed off her hands. Lady Macbeth's compulsive behavior of washing her hands, as if it serves as a purgative that could purify her contaminated mind, makes a link between human morality and cleanliness, as well as immorality and filth. This "Lady Macbeth Effect" intrigues many psychologists in the field, a large and growing work even has demonstrated that immoral thoughts and memories indeed put the mind into contamination, which physical act of washing might undo.
Te University psychological scientist Reuven Dar and his colleagues conducted an experiment on testing if actual cleansing might alleviate some of the obsessive thoughts among OCD suffers. He recruited a group of male and female OCD sufferers, whose symptoms vary. Dat also recruited a groups of people to serve as controls. Dar had each of the volunteers write a detailed narrative about an immoral act they had done in the past, as well as any associated emotions. The subjects wrote about lying to friends, stealing, infidelity and much more. Afterward, about half of each group washed their hand after they were told that this was the lad's recommendation for anyone using a public computer. They all then just complete rating their emotional state.
The last step before the experiment was finished, the volunteers were told that the study was completed and if they would volunteer for another one to help a desperate graduated student who was in need of funds. This step was included because in the original study, volunteers who did not wash their hands were more likely to act altruistically --- presumably to compensate for their immoral thoughts.
Dar wanted to see if a moral threat would be a motivation for the volunteers to help others, as if washing lessen this motivation. Furthermore, he wanted to see if these effects were more prominent among OCD sufferers.
And as a result, they were. Dar reports in the journal Clinical Psychological Science, hand washing did salve guilt about past misdeeds, and reduce willingness to help others. Meanwhile, the OCD patients were particularly susceptible to this effect --- none of the people who washed their hands showed inclination to lend a hand. Essentially, the ritualistic washing seems to create a sense of "moral relief".
This new finding suggests that the next step might be to help OCD patients develop more realistic ways of coping with guilt and moral lapse, so that they can break the cruel cycle of "Lady Macbeth Effect."
Here's the link to Rueven Dar's Article
http://journals.sagepub.com/doi/pdf/10.1177/2167702613485565