George worries about keeping his house secure while he is away. In fact, he worries so much that he's never sure whether he has locked his doors and windows so he has to go back and thoroughly check them or he is overwhelmed with anxiety. In addition, George is not satisfied checking the doors and windows just once. At last count, George had to complete his ritual check of the doors and windows exactly 37 times in a row to avoid a panic attack when he drives away. George's behavior is typical of a (n) .