Cognition is a required undergraduate course for majors in nearly all universities. This book provides students with a clear, accessible, and well-illustrated presentation of the field, starting with memory, the most accessible starting point to more complex theories and research in information processing. It presents an overall conceptual structure of cognition, organizing the material around the idea of the use of knowledge in carrying out the various cognitive processes. Pedagogically sensible and unique in organization, the book integrates classical and modern research as well as demonstration experiments for students to conduct with simple materials.