Fecha de publicación: -- Fuente: WIPO "tomato" An object of the present invention is to provide a novel agent for enhancing dopamine release, a novel agent for improving motor control function, a novel agent for improving motor learning function and a novel agent for improving activity motivation. To achieve the object, the present invention provides an agent for enhancing dopamine release, an agent for improving motor control function, an agent for improving motor learning function and an agent for improving activity motivation, each containing tryptophanylarginine as an active ingredient.