Individuals who have had mild or
transient psychotic symptoms (such as unusual thoughts, suspiciousness, perceptual disturbances) without using substances such as marijuana or alcohol and have a family history of psychosis or other risk factors are considered at clinical high risk for psychotic disorder.
While pre-existing drug - induced psychotic symptoms like hallucinations often disappear after STN DBS,
transient psychotic symptoms such as delirium may emerge in the immediate post-operative period.