The aim of the revised edition, like that of the first edition, is to make available to the college student and to the general reader investigations which are representative of the modern experimental treatment of important psychological topics. The title Recent Experiments in Psychology means that the book is designed to reflect contemporary trends in the science. However, not every experiment reported is recent in the sense that it has been performed within the last decade.
The investigations reviewed have been selected on the basis of their psychological importance and of their value and interest to the student. In general, each chapter includes an introductory section designed to orient the reader to the topic under consideration, a review of one or more pertinent experiments on the problem, and a concluding discussion in which the experimental results are interpreted from the viewpoint of their theoretical significance and of their application to problems of everyday interest. Only two chapters, XI and XIX, present material that is not chiefly or primarily experimental in nature.
All the experiments in this book are presented in a manner designed to make their aims, methods, results, and interpretation as clear as possible to the student who is not technically prepared to read the experimental literature in its original form. For this reason it has been necessary to make many changes in the terminology employed by the original author, to define terms possibly unfamiliar to the student, to amplify the descriptions of the methods used in the various experiments, to present the results in somewhat simplified form, and to include appropriate illustrative material. Hence, no chapter is in any sense a verbatim reproduction of the articles or books on which it is based. In order to bring the chapters to a convenient reading length, sections of the original experimental reports have been deleted or greatly condensed in certain cases. However, the reviewers have been careful to present with accuracy the factual material of every