A chemical entity of Formula (I):




wherein V, W, Y, and Z, have any of the values described herein, and compositions comprising such chemical entities; methods of making them; and their use in a wide range of methods, including metabolic and reaction kinetic studies; detection and imaging techniques; radioactive treatments; modulating and treating disorders mediated by PDE2 activity; treating neurological disorders, CNS disorders, dementia, cognitive disorders, neurodegenerative diseases, and trauma-dependent losses of function; enhancing the efficiency of cognitive and motor training, including in stroke or TBI rehabilitation; and treating peripheral disorders, including hematological, cardiovascular, gastroenterological, dermatological, inflammatory, and pain disorders.