Sentence:  Perhaps even more disturbing than the professionals' failure to discover their <WSD>pseudopatients</WSD>' “sanity,” the psychiatrists interpreted their “normal” behaviors as confirming the initial diagnoses. For example, when the <WSD>pseudopatients</WSD> kept notes of their experiences, one professional marked on a <WSD>pseudopatient</WSD>'s chart that he had engaged in “writing behavior.” In another case, a <WSD>pseudopatient</WSD> pacing the hall from boredom was interpreted as pacing from nervousness. 
Meaning of the word marked with <WSD> tags:  A person who poses as a patient so that  research may be conducted or staff trained.