By Leah Greenblatt
Updated July 11, 2008 at 04:00 AM EDT
Jessica Miglio

The two stars of the sweet, minor-key dramedy Diminished Capacity both suffer from the not-operating-with-a-full-deck malady of the title — sad-sack Chicago newspaperman Cooper (Matthew Broderick) due to a grade-3 concussion, and his dotty country uncle Rollie (Alan Alda) because of encroaching Alzheimer’s. When the pair embark on a road trip from Missouri back to the Windy City to sell Rollie’s valuable vintage baseball card (with Virginia Madsen along for the ride as Broderick’s former small-town love), the result is fairly silly slapstick, but Alda, hair disheveled and brow knit with stubborn intent, is both fierce and quietly heartbreaking. B+