Prodromal and Residual Symptoms

Psychotic symptoms that are not at the full intensity, frequency, or duration of a full psychotic disorder can often be observed in the period preceding a first episode of psychosis, which is then termed the prodromal phase. However, the prodrome can only be identified retrospectively (i.e., after the onset of the psychotic disorder), as the majority of individuals who experience these subthreshold psychotic symptoms will not go on to develop a psychotic disorder. To be able to identify those at higher risk of a psychotic disorder prospectively, the concept of ultrahigh risk (UHR) for psychosis was developed. Three UHR groups were defined: (1) attenuated psychotic symptoms group, which are subthreshold, attenuated positive psychotic symptoms; (2) brief limited intermittent psychotic symptoms group, which are full ...

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