One of the raps on iPods is that users tend to close themselves off from other people and retreat into their own private world.

But with stroke and dementia patients, iPods and other MP3 players are having just the opposite effect.

Listening to rap and reggae on a borrowed iPod every day has helped Everett Dixon, a 28-year-old stroke victim at Beth Abraham Health Services in Bronx, N.Y., learn to walk and use his hands again.

Trevor Gibbons, 52, who fell out of a fourth-floor construction site and suffered a crushed larynx, has become so entranced with music that he's written 400 songs and cut four CDs.

Ann Povodator, an 85-year-old Alzheimer's patient in Boynton Beach, Fla., listens to her beloved opera and Yiddish songs every day on an iPod with her home health aide or her daughter when she comes to visit. "We listen for at least a half-hour, and we talk afterwards," says her daughter, Marilyn Povodator. "It seems to touch something deep within her."