Alice was a B-plus student through her first three years at college. During the winter holidays in her senior year, while she was driving during a storm, her car ran off the road and hit a tree. Alice banged her head on the steering stake but never lost consciousness. She was treated for bruises arel discharged from the hospital within a day. But, back at her studies, she began to have difficulties. Suddenly her As and Bs were becomings. She had trouble remembering what she’d read and was initable and easily distracted．