New research on concussions

Meanwhile, new research shows that children who suffer even minor concussions may have lingering symptoms for up to a year.

The new Ohio State study reveals that while most children fully recover within a few months after a concussion, 20% do not.

The most common problem among children was forgetfulness; but some still experienced persistent attention difficulties, headaches and fatigue a year later.

Researchers say these children may need extra time taking tests at school or be allowed to wear sunglasses if bright lights cause headaches.