Purple hat therapy
Therapy crediting an unlikely new addition rather than established effective therapy
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The term "purple hat therapy" was coined by Gerald Rosen and Gerald Davison in their 2003 paper, Psychology should list empirically supported principles of change (ESPs) and not credential trademarked therapies or other treatment packages. The therapy is accepted as effective because it is assessed overall; the additional element of the "purple hat" is not tested as distinct and does not need to prove its extra worth. Its invention is followed by the publication of papers discussing it and special training courses.
In addition to introducing unnecessary elements into the treatment, purple hat therapies can hinder the scientific understanding of effective treatments for the condition in question.
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Application
Purple hat therapy has been used as an analogue for eye movement desensitization and reprocessing since it takes established exposure therapy and adds non-science based activities such as eye movement as a "purple hat".