During the last few years there has been an increasing interest in neural modelling of brain and cognitive disorders. This book presents a variety of such models in neurology, neuropsychology and psychiatry. A review of work in this area is given first. Computational models are presented of memory impairment in Alzheimer's disease, functional brain reorganization following a stroke, patterns of neural activity in epilepsy, disruption of language processes in aphasia and acquired dyslexia, altered cognitive processes in schizophrenia and depression, and related disorders.