#dementia__dementedness  mental deterioration of organic or functional origin
  supertype:  #insanity  relatively permanent disorder of the mind
  subtype:  #alcoholic_dementia__alcoholicdementia__alcohol_amnestic_disorder__Korsakoff's_psychosis__Korsakoff's_syndrome__Korsakov's_psychosis__Korsakov's_syndrome__polyneuritic_psychosis  dementia observed during the last stages of severe chronic alcoholism; involves loss of memory for recent events although long term memory is intact
  subtype:  #presenile_dementia__preseniledementia  dementia with onset before the age of 65
     subtype:  #Alzheimer's_disease__Alzheimer's__Alzheimers  a progressive form of presenile dementia that is similar to senile dementia except that it usually starts in the 40s or 50s; first symptoms are impaired memory which is followed by impaired thought and speech and finally complete helplessness
     subtype:  #Pick's_disease  a progressive form of presenile dementia found most often in middle-aged and elderly women and characterized by degeneration of the frontal and temporal lobes with loss of intellectual ability and transitory aphasia
  subtype:  #senile_dementia__senile_psychosis  dementia of the aged; results from degeneration of the brain in the absence of cerebrovascular disease

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