KARAKUWA, Miyagi Pref. — Zoom in for a snapshot of apparent normalcy: children sitting in a circle, clasping playing cards tightly in their hands. They laugh, chat and occasionally hop up to break into a goofy dance.

Zoom out and the picture changes: The children are kneeling on mattresses in a chilly classroom they now call home. An elderly woman cries nearby, wondering whether her mother was killed by the tsunami. Outside the school, a teacher fiddles with a radiation detector, checking to ensure the levels aren't high enough to make them sick — or worse.

Behind the smiling faces of thousands of children in shelters across this wave-battered wasteland, experts say there is often serious anxiety as everything these youngsters once held as normal is suddenly anything but.