The Colorado Longitudinal Twin Study is an ongoing research project of the Institute for Behavioral Genetics, which is a department of the University of Colorado at Boulder. Enrollment of both fraternal and identical infant twins in Colorado began in 1985 and continued for a period of 7 years. Since that time we have collected data from participating twins and their families on a regular basis, conducting home and lab visits at infancy and ages 7, 12, 16 and 17, and telephone interviews during non-visit years. The purpose of this research is to study the varying genetic and environmental influences on development, including cognition, temperament, physical development, intelligence and emotion.

Project Highlights We are continuing with assessments for the Center on Antisocial Drug Dependence Featured Article from the APA monitor: "A second look at twin studies". Learn about Executive Cognitive Functioning Article: Alcoholism and the Smoking Gene

The book Infancy to Early Childhood: Genetic and Environmental Influences on Developmental Change is now available to the public. This book contains more than 25 studies that focus on different aspects of infant development, from temperament to language acquisition. The data used for this scientific collection is drawn from research conducted with LTS participants when they were infants and young children. Click on the picture to be directed to the Amazon.com page where you can see excerpts from the book. Also, if you would like to borrow a copy from our library please contact us.