This book is the first part of an introduction to the field of cognitive psychology and basic cognitive processes. Specifically, it covers in depth the cognitive functions of attention, perception, and memory. It also includes a broad overview of the history of cognitive psychology and its methods, while addressing the issues of the physiology of cognitive processes and the organization and representation of knowledge. It is primarily written for undergraduate psychology students, but at the same time, it serves as a modern and user-friendly manual for the reader who, without any prior exposure to the science of psychology, wants to study the processes that allow us to understand the world. [Excerpt from the text on the back cover of the edition]