INTRODUCTION Psychology, I reached its science status by the hand of learning psychology (behavioral approach) in the first half of the 20th century Later, new currents were integrated into the scientific study of psychology incorporating new research objects. Cognitive processes were integrated into the classic themes of behavioral psychology. In parallel, and as a consequence of the emergence of new research objects, psychology diversified into multiple sub-disciplines: social psychology, occupational psychology, clinical psychology, evolutionary psychology, learning psychology, etc. In fact, this diversification also occurred within the same field of study, for example, in the educational field one could speak of educational psychology, school psychology, learning psychology, instructional psychology, etc. Now in the 21st century, the diversity of objects of study, and of sub-disciplines, demonstrates the strength of this science and its heuristic potential to continue advancing. In this sense, to speak of Psychological Research is to refer to various empirical domains, to multiple and varied participants, to a heterogeneous body of theories and to a multifaceted table of research objects. In other words, Psychological Research is shown as a path that branches off into multiple paths. An example is the research that is compiled in this book; its authors approach various research objects with the methodological rigor that the academic community demands. Each of these investigations was evaluated by a scientific committee formed expressly. In total, the book presents seven research reports. In chapter one Enrique Ibarra Aguirre presents his work, located in the field of self-referentiality, entitled "Self-concept of rural primary school teachers and the academic performance of their students". In chapter two Arturo Barraza Macías offers us an instrumental study, typical of the field of psychometry, called “Single item for the study of academic stress. Acceptability and evidence of convergent validity”.
PSYCHOLOGICAL INVESTIGATION. TRAILS WHICH FORK
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