blood flow drops the most in the frontal cortex, people most commonly experience declines in verbal fluency, or the ability to find the words they want. They also have to work harder at "executive function," planning and organizing their activities. The areas most affected after that include the parietal cortex, which affects construction and visuomotor performance (practice that golf swing!), and the medial temporal area, which affects the ability to make new long-term memories and think flexibly.