Providing a personal overview of hemispheric differences in human cognitive activity, Professor Efron is selective in his presentation of significant issues. To ensure a balanced overview, references are made to many books, review articles, and research reports that present opposing positions. Although additional material has been included in this book, the informal style of the oral presentation has not been altered. This volume may be perceived as a report of one man's opinion; however, the conclusions may reflect the views of a silent majority of cognitive neuroscientists.