Preface

A series of articles which can be divided into three major categories were accepted for volume six number one of the Psychological research records. Four research papers dealing with applications to social problems went through the double blind evaluation process: Family Problems and Migration of Adolescents; Institutional and Social Trust: An Inescapable Relationship; Risk Perception and Safety Climate in Drivers of Public Transport at Mérida, Yucatán; and Bullying and Tobacco: Are They Associated? A second category refers to psychometric research and is formed by four papers: Construction of a Short Version Scale of Trait Depression in Adolescents; Use of the Depression Anxiety Stress Scales (DASS-21) as Screening Tests in Clinical Youngsters; Psychometric Validation of the Mexican Adaptation of the Child Feeding Questionnaire; and Validity of the Positive Mental Health Scale in Mexican Children. The last category has a pair of basic processes research articles: Nicotine Effect on a Model of Hyperactivation of the Dopaminergic System using a Temporal Bisection Task: Towards a Model in Schizoprhrenia; and Working Memory and Fluid Intelligence. A Review of its Relations. As in precious issues, I wish to convey my deep appreciation to the carful work carried out by our editorial committee and to the scientific community for their original research.