Experimental: Older participant group

We will evaluate the performance of healthy older participants (N = 300, age range 60 to 89 years) for three days at enrollment and then at 6-month intervals for three years thereafter. The goal is to characterize changes in performance to aging and task experience in a group of older subjects.

Experimental: CCAB vs. manual test group

We will compare the performance of normal participants (N = 100, age range 18 to 89) on computerized and manually administered cognitive tasks.

Experimental: Test-Retest Reliability group

We will gather normative data from participants across the age range (N = 100, ages 18 to 89) for three days at enrollment, to better characterize test-retest reliability scores on Day 1 tasks.

Experimental: Health Disparities group

We will evaluate the performance of healthy older participants (N = 1200, age range 50 to 89 years) for three days at enrollment and then at 6-month intervals for three years thereafter. In the aim of better understanding health disparities in cognitive testing, this group will be divided into four cohorts: 300 African American participants; 300 Asian American participants; 300 Latino English-speaking participants; and 300 Latino Spanish-speaking participants, who will complete a Spanish translation of our computerized cognitive tests.