title: Slow-wave sleep and symptomatology in schizophrenia and related psychotic disorders.
abstract: Deficits in slow-wave sleep (SWS), or delta sleep, are frequently seen in schizophrenia, but their relationship with schizophrenic symptomatology remains unclear. We examined the association between visually scored and automated measures of SWS and positive and negative symptoms in a series of unmedicated patients with schizophrenia and related psychotic disorders. Total and average automated delta wave counts were significantly inversely associated with negative symptoms overall, and the psychomotor poverty syndrome in particular. Total delta counts were also inversely related to the disorganization syndrome. No relation was seen between reality distortion or the Brief Psychiatric Rating Scale (BPRS) positive symptoms and SWS. These findings support the view that SWS deficits may be related to negative symptoms of schizophrenia and may perhaps be mediated by impaired functioning of frontothalamic neural circuits.
authors.affiliation: Department of Psychiatry, University of Pittsburgh Medical School, Western Psychiatric Institute and Clinic, PA 15213, USA.
authors.forename: M S
authors.initials: MS
authors.lastname: Keshavan
authors.forename: J
authors.initials: J
authors.lastname: Miewald
authors.forename: G
authors.initials: G
authors.lastname: Haas
authors.forename: J
authors.initials: J
authors.lastname: Sweeney
authors.forename: R
authors.initials: R
authors.lastname: Ganguli
authors.forename: C F
authors.initials: CF
authors.lastname: Reynolds
mesh_terms: D000328:Adult; D001143:Arousal / Q000502:physiology; D002540:Cerebral Cortex / Q000503:physiopathology; D003700:Delta Rhythm; D003863:Depression / Q000175:diagnosis / Q000503:physiopathology / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000503:physiopathology; D019965:Neurocognitive Disorders / Q000175:diagnosis / Q000503:physiopathology* / Q000523:psychology; D017286:Polysomnography; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000175:diagnosis / Q000503:physiopathology* / Q000523:psychology; D012559:Schizophrenia / Q000175:diagnosis / Q000503:physiopathology*; D012565:Schizophrenic Psychology; D012894:Sleep Stages / Q000502:physiology*; D013788:Thalamus / Q000503:physiopathology