Brain imaging and neurophysiological methods have been rapidly developed. The purpose of this book is to describe hearing problems which are caused by various kinds of brain diseases in the central auditory pathway. The book's most important feature is that anatomical data of CT, MRI, and neuropathological and neurophysiological data of ABR and MEG in patients are compared with neuropsychological data. The book explains what happens to patients when the bilateral auditory nerve and the auditory cortex are damaged. Some patients can hear but cannot discriminate meanings of speech, music and environmental sounds. The author tries to explain differences occur.