Invitation to Psychology Interactive Chapter Guide Contents Chapter Four: Neurons, Hormones, and the Brain INTRODUCTION The relationship between brain and behavior has had a tremendous impact in understanding why people do the things that they do. The mysteries of the brain will be revealed. KEY CONCEPTS Each link will take you to a specific concept section of the Interactive Chapter Guide: Nervous System: A Basic Blueprint Communication in the Nervous System Mapping the Brain A Tour Through the Brain The Two Hemispheres of the Brain Two Stubborn Issues in Brain Research Taking Psychology with You: Diet and Nutrition Looking Back: Review of the What's Ahead Questions First Concept: Nervous System: A Basic Blueprint