title: Relationships between behavioral syndromes and cognitive domains in Alzheimer disease:  the impact of mood and psychosis.
abstract: OBJECTIVE
  Behavioral disturbances occur in nearly all Alzheimer disease (AD) patients together with an array of cognitive impairments. Prior investigations have failed to demonstrate specific associations between them, suggesting an independent, rather than shared, pathophysiology. The objective of this study was to reexamine this issue using an extensive cognitive battery together with a sensitive neurobehavioral and functional rating scale to correlate behavioral syndromes and cognitive domains across the spectrum of impairment in dementia.
  
  
  METHODS
  Cross-sectional study of comprehensive cognitive and behavioral ratings in subjects with AD and mild cognitive impairment.
  
  
  METHODS
  Memory disorders research center.
  
  
  METHODS
  Fifty subjects with AD and 26 subjects with mild cognitive impairment; and their caregivers.
  
  
  METHODS
  Cognitive rating scales administered included the Mini-Mental State Examination; the Modified Mini-Mental State Examination; the Boston Naming Test; the Benton Visual Retention Test; the Consortium to Establish a Registry for Alzheimer's Disease Neuropsychology Assessment; the Controlled Oral Word Test; the Wechsler Memory Scale logical memory I and logical memory II task; the Wechsler Memory Scale-Revised digit span; the Wechsler Adult Intelligence Scale-Revised digit symbol task; and the Clock Drawing Task together with the Clinical Dementia Rating Scale and the Neuropsychiatric Inventory.
  
  
  RESULTS
  Stepwise regression of cognitive domains with symptom domains revealed significant associations of mood with impaired executive function/speed of processing (Δr = 0.22); impaired working memory (Δr = 0.05); impaired visual memory (Δr = 0.07); and worsened Clinical Dementia Rating Scale (Δr = 0.08). Psychosis was significantly associated with impaired working memory (Δr = 0.13).
  
  
  CONCLUSIONS
  Mood symptoms appear to impact diverse cognitive realms and to compromise functional performance. Among neuropsychological indices, the unique relationship between working memory and psychosis suggests a possible common underlying neurobiology.
authors: The Litwin-Zucker Research Center for the Study of Alzheimer's Disease and Memory Disorders, The Feinstein Institute for Medical Research, The North Shore-Long Island Jewish Health System, Manhasset, NY, USA. jkoppel@lij.edu
authors: Jeremy
authors: J
authors: Koppel
authors: Terry E
authors: TE
authors: Goldberg
authors: Marc L
authors: ML
authors: Gordon
authors: Edward
authors: E
authors: Huey
authors: Peter
authors: P
authors: Davies
authors: Linda
authors: L
authors: Keehlisen
authors: Sara
authors: S
authors: Huet
authors: Erica
authors: E
authors: Christen
authors: Blaine S
authors: BS
authors: Greenwald
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D003072:Cognition Disorders / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D015331:Cohort Studies; D015897:Comorbidity; D003430:Cross-Sectional Studies; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D008609:Mental Status Schedule / Q000706:statistics & numerical data; D008875:Middle Aged; D019964:Mood Disorders / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D009483:Neuropsychological Tests / Q000706:statistics & numerical data; D009518:New York; D011594:Psychometrics / Q000706:statistics & numerical data; D011618:Psychotic Disorders / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D015203:Reproducibility of Results; D013223:Statistics as Topic; D013577:Syndrome