P3‐463: TRAJECTORY OF NEUROPSYCHOLOGICAL TEST SCORES IN MILD COGNITIVE IMPAIRMENT COMPARING PRIMARY AGE‐RELATED TAUOPATHY VERSUS ALZHEIMER DISEASE. (1st July 2019) - Teylan, Merilee; Mock, Charles; Gauthreaux, Kathryn; Chen, Yen-Chi; Gary Chan, Kwun Chuen; Hassenstab, Jason; Besser, Lilah M.; Kukull, Walter A.; Crary, John F.