This book outlines the electro-activity in the human body, human behavior, and other bio-information during image viewing and applies it to a hygienic and clinical setting. The book begins by explaining the basic science of brain measurements and the endocrine system, before analyzing the bio-signals obtained from electrocardiogram (ECG), electrogastrography (EGG), electro-oculography (EOG) and much more. As the book subsequently demonstrates, these bio-signals can be measured using wearable devices, and the data can be used to detect undiagnosed diseases and health-relevant abnormalities. Especially in the field of nursing care for the elderly and rehabilitation, these new options for the management and analysis of biological information hold considerable potential.  Bio-information for Hygiene offers a valuable resource for both new and established researchers, as well as students who are seeking comprehensive information on environmental/occupational health and healthpromotion. It will also assist technical staff whose work involves bio-informatics.