Hellenic Journal of Psychology   Psychological Society of Northern Greece VOLUME 2, ISSUE 3 INFORMATION HELLENIC JOURNAL OF PSYCHOLOGY ΙSSN 1790-1391 Edited three times a year by the Psychological Society of Northern Greece (PSNG) Volume 2, Issue 3, 2005 Legally responsible: Anastasia Efklides, President of the Psychological Society of Northern Greece School of Psychology, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece. Tel: ++30-2310-997374. Fax: ++30-2310-997384. E-mail: efklides@psy.auth.gr Editors Editor-in-Chief:  Anastasia Efklides Aristotle University of Thessaloniki, Greece Associate Editors: Maria Dikaiou Angeliki Leondari Georgios D. Sideridis Aristotle University of Thessaloniki, Greece University of Thessaly, Greece University of Crete, Greece Assistant Editors: Irini Dermitzaki Mary H. Kosmidis Robert Mellon Plousia Misailidi Pagona Roussi University of Thessaly, Greece Aristotle University of Thessaloniki, Greece University of Crete, Greece University of Ioannina, Greece Aristotle University of Thessaloniki, Greece Guest Editor of Issue 3 Anastasia Efklides Aristotle University of Thessaloniki, Greece Editorial Board Anastasia Efklides Shulamith Kreitler Diomedes Markoulis Markku Niemivirta Jose M. Prieto Yannis Theodorakis Maria Tzouriadou Marja Vauras Marcel Veenman Aristotle University of Thessaloniki, Greece Tel-Aviv University, Israel Aristotle University of Thessaloniki, Greece University of Helsinki, Finland Complutense University, Madrid, Spain University of Thessaly, Volos, Greece Aristotle University of Thessaloniki, Greece University of Turku, Finland University of Leiden, The Netherlands Publisher: ELLINIKA GRAMMATA: Emm. Benaki 59, 106 81 Athens, Greece Τel: ++30-210-3891800 - Fax: ++30-210-3836658 Bookstore: Zood. Pigis 21 & Tzavela 1, 106 81 Athens, Greece © Copyright 2004: Psychological Society of Northern Greece (PSNG) All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) for commercial purposes without the written permission of the copyright own-ers. Manuscripts submitted to the journal in no case are returned back Volume 2, Issue 3, 2005     HELLENIC JOURNAL OF PSYCHOLOGY Founded 2004 Editor: Anastasia Efklides               ELLINIKA GRAMMATA   CONTENTS Japanese grandparenthood and psychological well-being           Fumie Inatani, Takeko Maehara, & Akira Tsuda...............................................................199 Patterns of health-related behaviours among Hellenic students          Yannis Theodorakis, Athanasios Papaioannou,           Antonis Hatzigeorgiadis, & Evanthia Papadimitriou.............................................................225 The theory of planned behaviour and health behaviours: Critical analysis of methodological and theoretical issues           Bojan Bilic.................................................................................................................243 The social representation of the condom amongst Greek students: An object drawn from social obscurity into the spotlight          Panos S. Kordoutis, Jasmin-Olga Sarafidou, & Mary Loumakou.............................................260 Drug addiction and the brain           George Panagis...........................................................................................................287