Editing Openai/69129290-140c-8005-84d5-beb8383f8282 (section)

===== 🧩 Why the exact study may be hard to track =====
* The description (“women told they would be given a hormone injection to bring on their periods two weeks early, but they were only given a saline placebo, and 70% developed early premenstrual tension”) suggests a deception or expectancy-manipulation study (i.e., the belief induced the effect). These types of studies, especially older ones, may not have been published in easily searchable journals, or may be described in books/monographs rather than peer-reviewed journals.
'' It may be referenced by David R. Hawkins (in ''Map of Consciousness) in a secondary way (as anecdote or summary) rather than a citation of a formal peer-reviewed paper. Thus the exact wording may differ.
* Ethical standards around deception in human subjects have tightened over time; so older studies with such deceptions may be out of print or less cited.