The cortex continues to be the subject of intense scientific curiosity, as it has been for the past 30 years. It is the most highly developed part of the brain, yet the youngest in evolutionary terms. It is fundamental to human behaviour, thinking, and self-understanding, and a study of its structure and performance must encompass aspects of anatomy, physiology, psychology, and neurology. This book provides a unique account of the structural and functional organization of the cerebral cortex from the point of view of one of the pioneers in the field. It is a revised and updated translation of the author's classic German text, and brings together for the first time the biological, psychological, and philosophical strands of enquiry relating to this fascinating area of the brain. The author's outstanding scientific reputation, combined with a subject of intense interest to researchers, will ensure that this book will be valued both for its scientific and historical contributions.