Dear Diary (IMAGE) Southern Methodist University Caption Participants in the SMU study were 51 couples who completed daily diaries about their mood and the mood of their partners for seven consecutive nights. The study veers from conventional approaches, which have relied on interviewing couples in a lab setting about feelings related to conflicts in their relationship. (Southern Methodist University, Dallas) Credit Southern Methodist University Usage Restrictions Please credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.