A scientific publication written in the early 20th century. The book serves as a comprehensive examination of adult psychological processes, aiming to report findings about human mental life while also addressing any gaps in the current knowledge through either original research or theoretical hypotheses. The opening of the work establishes its intent and scope, discussing the dual objectives of presenting established research on the psychology of adults and filling in the remaining gaps in understanding. Lindworsky emphasizes the difference between experimental psychology, focusing on observable psychological phenomena, and philosophical psychology that seeks to understand the essence of these phenomena. The introduction articulates how the experimental psychologist's study of individual psychological facts paves the way for philosophical inquiry, setting the stage for a rigorous exploration into the methods and elements of psychological study that will follow in the subsequent chapters.
