There are a number of syndromes that may precede the onset of psychosis. One of these "high risk" syndromes is the Attenuated Positive Symptoms (APS) Syndrome.
Criteria for the diagnosis of the APS Syndrome:
(1) symptoms have begun or gotten worse during the past year
(2) symptoms occur at least once per week for the past month
(3) symptoms are unusual but below the threshold for frank psychosis:
(3a) unusual thought content
(3b) suspiciousness or paranoia
(3c) "organization of communication" (circumstantial speech that is difficult to follow but not incoherent)
Exclusion criteria: presence of psychosis
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