Twin Study (LTS) This longitudinal study began recruiting
twins in 1985 and recruitment lasted for a period of 7 years.
The oldest twins are now 17 and the youngest are 11. Each year
the twins are contacted for a different type of interview. We
have conducted home visits, lab visits, and telephone interviews
that cover many different aspects of human behavior and development.
The wealth of data from these studies has led to the publication
of over 75 journal articles and a book in 2001.
Colorado Adolescent Twin Survey (CATS)
In this study, twins fill out questionnaires on a range of topics
including information about their personality, history of substance
use, and demographics. These twins are contacted through the Colorado
Twin Registry, which is developed with assistance from the Colorado
Departments of Health
This study began in 1997, and thus far over 1000 families have
participated. The youngest respondents are 12 years old whereas
the oldest twin pairs are in their 60's.
Twin Study (CTS) For this project twins ages
12-18 and their siblings throughout Colorado participate in a
2 1/2 hour interview that covers questions about personality,
behavior, intelligence and various mood and conduct disorders.
Participants that meet certain criteria are then contacted for
a more extensive follow up interview.
Reading Project (CRP) Since its inception in 1982,
the CRP has worked with over 1400 twin pairs to assess and find
factors that contribute to the development of various reading
disabilities. This testing is conducted over 2 days with twin
participants contacted throughout school districts in Colorado.
Recruitment for this project is ongoing.
Twin Study of Reading Disability (LTSRD) This new study
is a 5-6 year follow up with 12-25 year-old twins who participated
in the CRP. It is the first time a longitudinal study has been conducted
with twins who have reading disorders. The initial study calls for
an abbreviated battery that assesses cognitive, behavioral and reading
abilities and will enroll 200 twin pairs and 50 of their siblings.
Study of Early Reading Development (LSERD) This study,
a collaborative effort with the University of New England in Australia
and Stavanger University in Norway, is designed to study genetic
and environmental influences on early reading and attention development.
Identical and Fraternal twins are being tested in preschool for
pre-reading skills, and after kindergarten, first grade, and second
grade for the development of early reading, spelling, and related
cognitive skills. Enrollment
is ongoing for same sex twins south of Fort Collins and north
of Colorado Springs.
Adult Twin Smoking Study (ATSS)
New this spring, the ATSS looks at smoking behavior in twin smokers
over 18 years of age who live in Colorado. So far less than 20
twin pairs have participated, mostly due to the selective criteria
necessary to participate. While in the lab, participants in this
study smoke cigarettes and perform a variety of tasks while their
heart rates are monitored.