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This page intentionally left blank Your First Study Break www.CengageBrain.com Get the best grade in the shortest time possible! Get the best grade in the shortest time possible! Buy the way you want and save. Buy the way you want and save. Now that you’ve bought the textbook . . . Get a break on the study materials designed for your course! Visit CengageBrain.com and search for your textbook to fi nd discounted print, digital, and audio study tools that allow you to: • Study in less time to get the grade you want using online resources such as chapter quizzing, fl ashcards, and interactive study tools. • Prepare for tests anywhere, anytime. • Practice, review, and master course concepts using printed guides and manuals that work hand-in-hand with each chapter of your textbook. This is an electronic version of the print textbook. Due to electronic rights restrictions, some third party content may be suppressed. Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. The publisher reserves the right to remove content from this title at any time if subsequent rights restrictions require it. For valuable information on pricing, previous editions, changes to current editions, and alternate formats, please visit www.cengage.com/highered to search by ISBN#, author, title, or keyword for materials in your areas of interest. Abnormal Psychology A N I N T E G R AT I V E AP P R O A C H SIXTH EDITION Australia • Brazil • Japan • Korea • Mexico • Singapore • Spain • United Kingdom • United States David H. Barlow Boston University V. Mark Durand University of South Florida–St. Petersburg 43620_00_FM_i-xxv.indd i 43620_00_FM_i-xxv.indd i 12/27/10 1:47 PM 12/27/10 1:47 PM Printed in Canada 1 2 3 4 5 6 7 14 13 12 11 © 2012, 2009 Wadsworth, Cengage Learning ALL RIGHTS RESERVED. No part of this work covered by the copyright herein may be reproduced, transmitted, stored, or used in any form or by any means, graphic, electronic, or mechanical, including but not limited to photocopying, recording, scanning, digitizing, taping, Web distribution, information networks, or information storage and retrieval systems, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without the prior written permission of the publisher. Library of Congress Control Number: 2010940910 Student Edition: ISBN-13: 978-1-111-34362-0 ISBN-10: 1-111-34362-4 Loose-leaf Edition: ISBN-13: 978-1-111-34551-8 ISBN-10: 1-111-34551-1 Wadsworth 20 Davis Drive Belmont, CA 94002-3098 USA Cengage Learning is a leading provider of customized learning solutions with offi ce locations around the globe, including Singapore, the United Kingdom, Australia, Mexico, Brazil, and Japan. Locate your local offi ce at www.cengage.com/global Cengage Learning products are represented in Canada by Nelson Education, Ltd. To learn more about Wadsworth visit www.cengage.com/wadsworth Purchase any of our products at your local college store or at our preferred online store www.cengagebrain.com Abnormal Psychology: An Integrative Approach, Sixth Edition David H. Barlow / V. Mark Durand Senior Acquiring Sponsoring Editor: Jaime Perkins Senior Developmental Editor: Kristin Makarewycz Assistant Editor: Paige Leeds Editorial Assistant: Jessica Alderman Media Editor: Lauren Keyes Senior Marketing Manager: Elisabeth Rhoden Marketing Assistant: Janay Pryor Marketing Communications Manager: Laura Localio Senior Content Project Manager: Pat Waldo Design Director: Rob Hugel Senior Art Director: Vernon Boes Print Buyer: Linda Hsu Rights Acquisitions Specialist: Dean Dauphinais Production Service: Megan Greiner, Graphic World Inc. Text Designer: Ellen Pettengell Photo Researcher: Lisa Jelly Smith, PreMedia Text Researcher: Karyn Morrison Copy Editor: Graphic World Inc. Illustrators: Graphic World Inc. and Argosy Cover Designer: Paula Goldstein Cover Image: Paul Vozdic/Getty Images Compositor: Graphic World Inc. For product information and technology assistance, contact us at Cengage Learning Customer & Sales Support, 1-800-354-9706. For permission to use material from this text or product, submit all requests online at www.cengage.com/permissions. Further permissions questions can be emailed to