unitary psychosis
... that there was a widespread belief in 19th-century German psychiatry that all forms of mental illness were simple variations of a single unitary psychosis?
... that there was a widespread belief in 19th-century German psychiatry that all forms of mental illness were simple variations of a single <b id="mwDNw"><a href="./Unitary_psychosis" id="mwDN0" rel="mw:WikiLink" title="Unitary psychosis">unitary psychosis</a></b>?