This new edition presents an integrated approach to neurotoxicology, the study of organisms’ responses to changes in their environment and how interruption of the flow of information by chemical exposure causes a wide range of effects – from learning deficits, sensory disturbances in the extremities, and muscle weakness to seizures and signs similar to neurodegenerative disorders such as Parkinson’s or Alzheimer’s disease. It is an essential resource for understanding the sites and mechanisms of neurotoxicity, for formulating testable hypotheses about the effects of neurotoxicants, and for improving the risk assessment process.