macbeth effect

Here is an interesting vignette demonstrating how washing one's hands turns ones self-assessment towards the optimistic and provides a sense of closure. In clinical trials at least, in what could be named after Lady Macbeth or Pontius Pilate, subjects felt better after failing to accomplish an impossible task when encouraged to wash up afterwards. Egos from the hand-washers recovered significantly faster than those who did not, the study shows. I wonder, however, if the therapeutic results have to do with the body exorcizing defeat in the the mind symbolically or rather the low-hanging fruit effect, being assigned a very easy job after presented with one that was very hard.