 The proposed research investigates whether exposure to a computer-based training protocol designed to enhance cognitive control processes will improve cognitive performance in healthy older adults. Cognitively normal adults aged 60-75 will be randomized into three experimental groups: 1 Video game play with training strategy; 2 Video game play without training strategy Active Control; 3 Minimal contact Passive Control. Subjects in Groups 1 and 2 will be instructed to play the complex, high-demand video game, Space Fortress, for 36 one-hour sessions over 12 weeks. Subjects in Group 3 will receive all assessments but will not play the computer game. 