<prompt> Answer this question truthfullyWhat is the Pygmalion effect and how does it relate to documenting positive outcomes in a treatment group?  <response>: <reason> The Pygmalion effect is a phenomenon where an observers expectations of a person or group can influence the observers behavior towards them and ultimately affect the outcome. In the case of a treatment group, an observer expecting the group to show signs of recovery is more likely to document positive outcomes, even if they are not objectively present, due to the Pygmalion effect. 