Additional Information About ABCD

Thank you for your interest in learning more about the Adolescent Brain Cognitive Development (ABCD) Study, being conducted by a consortium of academic sites including Virginia Commonwealth University. Below you will find information about MATR recruitment and general information about the study.

As a quick reminder, when calling, our Interviewers always provide their name and say that they are calling from Virginia Commonwealth University and/or the Mid-Atlantic Twin Registry.

Here are some of the numbers that our Interviewers make calls from:


The best ways to reach the MATR are by leaving a voicemail on our toll-free number (1-800-URA-TWIN) or emailing us at

Documents with Additional Information

Sample of the Study ‘Heads-Up’ or Introduction Letter

We may have sent this letter to let you know to expect our phone call about the study. In case you didn’t receive a copy of this letter or no longer have your copy, a sample of that letter is provided here:

General Study Information

Below are links to websites and documents related to the study that provide information about the study in general as well as about the VCU study site.

Summary of the MATR Phone Call

This will give you a good idea of what we will discuss with you on the phone during the MATR phone call with one of our MATR Interviewers.