1. How the Brain Works: Structure and Function -- 2. The Simplest Nervous Systems: Neurons, Nerve Nets, and Behavior -- 3. Centralization and Symmetry: Ganglia and Nerves -- 4. The Basic Vertebrate Plan: Nervous System Topology -- 5. Brain and Behavior: A Four Systems Networks Model -- 6. The Motor System: Coordinating External and Internal Behaviors -- 7. The Behavioral State System: Intrinsic Control of Sleep and Wakefulness -- 8. The Cognitive System: Thinking and Voluntary Control of Behavior -- 9. The Sensory System: Inputs from the Environment and the Body -- 10. Modifiability: Learning, Stress, Cycles, and Damage Repair -- 11. Gene Network: Relationship to Neural Networks.