We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Article |

Early Characteristics of Monozygotic Twins Discordant for Schizophrenia

James R. Stabenau, MD; William Pollin, MD
Arch Gen Psychiatry. 1967;17(6):723-734. doi:10.1001/archpsyc.1967.01730300083011.
Text Size: A A A
Published online


IN THE ATTEMPT to understand why schizophrenic symptoms appear in one individual and not in another, major investigative efforts have been directed toward: (1) assessing the genetic component which controls the cellular and physiologic characteristics of the central nervous system, thereby influencing what is called temperament, nervous disposition, personality, or mind; (2) assessing the environmental experiential factors which temper the degree of development and expression of the personality; or (3) the complex interaction of endowment and environment.

The study of pairs of monozygotic twins, when one twin has developed schizophrenic symptomatology and the other has not, has the unique research power of controlling for the genetic differences which occur between siblings and randomly selected individuals. Differences in environmental experience from the intra-uterine period through the onset of illness are therefore highlighted in these pairs.

Characteristics of an infant at birth, the classically designated time for the "begin


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

First Page Preview

View Large
First page PDF preview





Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.


Some tools below are only available to our subscribers or users with an online account.

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

Customize your page view by dragging & repositioning the boxes below.