Figure 3.

Neuropsychological performance in aged OVX-veh and OVX-E monkeys. Top, Mean number of trials required to reach the acquisition criterion on the DR task at 0 and 1 sec delays (left), and mean percent correct across delays of 5–60 sec (right). Middle, Mean trials required to learn the DNMS procedure with a 10 sec delay (left), and mean percent correct across retention intervals of 15–600 sec (right). Bottom, Mean percent correct across 10-trial blocks of object discrimination learning (days 1 and 2), and retention after 48 hr (day 3). With the exception of one case in which an OVX-E animal completed only three problems, scores for individual animals were averaged across four discriminations. Error bars indicate SEM.