title: Memory and MRI-based hippocampal volumes in aging and AD.
abstract: OBJECTIVE
  To demonstrate structural-functional relationships between MRI-based volumetric measurements of medial temporal lobe structures and cognitive function.
  
  
  BACKGROUND
  Previous work has documented the ability of MRI-based measurements of the hippocampus to discriminate between age-matched control subjects and patients with very mild AD. Relatively less is known about the correlation between medial temporal lobe structures and cognitive functions.
  
  
  METHODS
  We evaluated structural-functional relationships among the hippocampal formation, parahippocampal gyrus, and amygdala, and measures of memory, language, and general cognitive performance in 220 probable AD patients and normal control subjects. Standardized instruments of memory and general cognitive function were used to assess subjects enrolled in a longitudinal study of aging and dementia.
  
  
  RESULTS
  The volume of the hippocampal formation predicted performance on most acquisition and recall measures across the spectrum of normal aging and AD. If the groups were segregated, most of the expected associations between medial temporal lobe structures and memory measures were observed in the AD patients.
  
  
  CONCLUSIONS
  MRI-based hippocampal volumetry accurately depicts the structural-functional relationships between memory loss and hippocampal damage across the spectrum from normal aging to dementia.
authors.affiliation: Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
authors.forename: R C
authors.initials: RC
authors.lastname: Petersen
authors.forename: C R
authors.initials: CR
authors.lastname: Jack
authors.forename: Y C
authors.initials: YC
authors.lastname: Xu
authors.forename: S C
authors.initials: SC
authors.lastname: Waring
authors.forename: P C
authors.initials: PC
authors.lastname: O'Brien
authors.forename: G E
authors.initials: GE
authors.lastname: Smith
authors.forename: R J
authors.initials: RJ
authors.lastname: Ivnik
authors.forename: E G
authors.initials: EG
authors.lastname: Tangalos
authors.forename: B F
authors.initials: BF
authors.lastname: Boeve
authors.forename: E
authors.initials: E
authors.lastname: Kokmen
mesh_terms: D000368:Aged; D000375:Aging / Q000473:pathology* / Q000502:physiology*; D000544:Alzheimer Disease / Q000473:pathology* / Q000503:physiopathology* / Q000523:psychology; D004569:Electroencephalography; D005260:Female; D006624:Hippocampus / Q000473:pathology* / Q000503:physiopathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008568:Memory / Q000502:physiology*; D009483:Neuropsychological Tests; D011237:Predictive Value of Tests; D011569:Psychiatric Status Rating Scales