Scientists have long assumed that "compulsive" personalities are typical suicide candidates. Therefore, in the last two decades research has focused on finding biological clues to "compulsiveness."
長久以來，科學家推測，「衝動」性格是自殺的指標，因此近二十年有關自殺的研究，一直致力於尋找與「衝動」有關的生物線索。