TITLE OF STUDY: Till Death Do Us Part: The Influence of Individual Differentiation Levels, Attachment Security, and Co-Twin’s Attitude on Marital Outcomes in Identical Twins

PRINCIPAL INVESTIGATOR: Dominique L. Walker

ADVISOR: Dr. Lisabeth DiLalla, Professor, Family & Community Medicine; Population Science and Policy; and School of Psychological and Behavioral Sciences, Southern Illinois University; Director: Southern Illinois Twins/Triplets and Siblings Study (SITSS)

PARTICIPANTS NEEDED: Identical twins between the ages of 22 and 44 where one twin identifies as married in a monogamous relationship and the other twin identifies as unmarried (which can include being single, engaged, or in a relationship).

LOCATION: Anywhere in the United States

PURPOSE OF STUDY: This study explores marital decisions among the twin population.

METHOD OF INVESTIGATION: Participation involves the completion of an online survey for the first phase, and twins selected for the second phase will participate in a recorded video interview (audio available) held on Zoom.

SPONSORING INSTITUTION: Alliant International University

INITIATION DATE: January 2025

COMPLETION DATE: May 2025

FOR MORE INFORMATION OR TO VOLUNTEER TO JOIN THE STUDY, EMAIL Dominique L. Walker at dwalker4@alliant.edu.