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TWIN RESEARCH Proceedings of the Second International Congress on Twin Studies August 29—September 1, 1977 Washington, DC Part A Psychology and Methodology EDITOR WALTER E NANCE Chairman, Department of Human Genetics Virginia Commonwealth University Medical College of Virginia Richmond, Virginia ASSOCIATE EDITORS GORDON ALLEN National Institute of Mental Health Rockville, Maryland and PAOLO PARISI Gregor Mendel Institute Rome, Italy ALAN LISS, INC © NEW YORK e 1978 © 1978 Alan R. Liss, Inc. Addressall inquiries to the publisher: Alan R. Liss, Inc. 150 Fifth Avenue New York, New York 10011 Printed in the United States of America Under the conditions stated below the owner of copyright for this book hereby grants permission to users to make photocopy reproductions of any partor all of its contents for personal or internal organizational use, or for personal or internal use of specific clients. This consent is given on the condition that the copier pay the stated per copy fee through the Copyright Clearance Center Incorporated, PO Box 765, Schenectady, NY 12301, as listed in the most current issue of ‘Permissions to Photocopy’’ (Publisher’s Fee List, distributed by CCC Inc) for copying beyond that permitted by sections 107 or 108 of the US Copyright Law. This consent does not extend to other kinds of copying, such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. Library of Congress Cataloging in Publication Data International Congress on Twin Studies, 2d, Washington, D.C., 1977. Twin research. (Progress in clinical and biological research; v. 24, pts. A—C) Includes bibliographies. Contents: pt. A. Psychology and methodology. — pt. B. Biology and epidemiology. — pt. C. Clinical studies. 1. Twins — Congresses. 2. Twins — Psychology — Congresses. 3. Diseases in twins — Congresses. 4. Birth, Multiple — Congresses. |. Nance, Walter E. It. Allen, Gordon, 1919— ltl. Parisi, Paolo. IV. Title. V. Series TDNLM: 1. Twins — Congresses. 2. Research — Congresses. W1 PR668E v. 24 /WQ235 I59 1977t] RG696.155 1977 618.2’5 78-8480 3 Volume Set ISBN 0-08451-0024-6 Part A: Psychology and Methodology ISBN 0-8451-0150-1 TWIN RESEARCH Part A Psychology and Methodology PROGRESSIN CLINICAL AND BIOLOGICAL RESEARCH Series Editors George J. Brewer Vincent P. Eijsvoogel Robert Grover Kurt Hirschhorn SeymourS. Kety Sidney Undenfriend, Jonathan W. Uhr Vol 1: Erythrocyte Structure and Function, George J. Brewer, Editor Vol 2: Preventability of Perinatal Injury, Karlis Adamsons and Howard A.Fox, Editors Vol 3: Infections of the Fetus and the NewbornInfant, Saul Krugman and AnneA. Gershon, Editors Vol 4: Conflicts in Childhood Cancer, Lucius F. Sinks and John O. Godden, Editors Vol 5S: Trace Components of Plasma: Isolation and Clinical Significance, G.A. Jamieson and T.J. Greenwalt, Editors Vol 6: Prostatic Disease, H. Marberger, H. Haschek, H.K.A. Schirmer, J.A.C. Colston, and Vol 7: Blood Pressure, Edema and Proteinuria in Pregnancy,Emanuel A. Friedman, Editor 8: Cell Surface Receptors, Garth L. Nicolson, Michael A. Raftery, Martin Rodbell, and C. Fred Fox, Editors 9: Membranesand Neoplasia: New Approachesand Strategies, Vincent T. Marchesi, Vol Vol E. Witkin, Editors Editor Vol 10: Diabetes and Other Endocrine Disorders During Pregnancy and in the Newborn, Maria I. New and Robert H. Fiser, Editors Vol 11: Clinical Uses of Frozen-Thawed Red Blood Cells, John A. Griep, Editor Vol 12: Breast Cancer, Albert C. W. Montague, Geary L. Stonesifer, Jr., and Edward F. Lewison, Editors Vol 13: The Granulocyte: Function and Clinical Utilization, Ti