This book provides an overview of attentional impairments in brain-damaged patients from both clinical and neuroscientific perspectives, and aims to offer a comprehensive, succinct treatment of these topics useful to both clinicians and scholars. A main focus of the book concerns left visual neglect, a dramatic but often overlooked consequence of right hemisphere damage, usually of vascular origin, but also resulting from other causes such as neurodegenerative conditions. The study of neglect offers a key to understand the brain’s functioning at the level of large-scale networks, and not only based on discrete anatomical structures. Patients are often unaware of their deficits (anosognosia), and often obstinately deny being hemiplegic. Diagnosis is important because neglect predicts poor functional outcome in stroke. Moreover, effective rehabilitation strategies are available, and there are promising possibilities for pharmacological treatments.