Affective symptoms

Depressive features are commonly seen and may indicate a better prognosis.(7) Cognitive deficits

Paranoid and schizophrenia-like psychoses can complicate Alzheimer's disease or dementia associated with Lewy bodies, but in such cases disorders of memory and concentration can generally clearly be seen to have preceded the emergence of persecutory symptoms. Many patients with psychoses that begin in old age have subtle and apparently only slowly progressive cognitive deficits; these do not constitute dementia and are not the same as schizophrenic negative symptoms, but seem to be more significant than the cognitive symptoms that accompany early-onset schizophrenia. Even the most cognitively intact of these patients appear to be impaired on 'executive' cognitive functions such as attention set-shifting ability and planning. (8)

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