The flash visual evoked potential P2 component is delayed in
etiologically mixed groups of demented patients compared to healthy
controls or nondemented patients. This study compared patients meeting both
DSM-III-R criteria for dementia and NINCDS-ADRDA criteria for probable
Alzheimer's disease (AD) with healthy elderly controls and found the P2
delay in the probable AD group. Additional comparisons found no evidence of
a P2 delay in demented unlikely AD patients. These results suggest that
earlier findings of a delayed P2 in etiologically mixed demented groups may
have been due to inclusion of AD patients.Abstract Teaser