Various aspects of human nature: curiosity, pain, pleasure, movement, reasoning, learning, memory, emotion, madness. Nervous systems of different species evolved from common ancestors: anthropology. Therefore they may have common mechanisms: but. Many behavioral traits are highly specialized for the environment (niche) a species normally occupies: look at differences and similarities in terms of particular functions and their mechanisms. Look at an owl which has highly distinct visual capabilities: animal models provide information that we may not otherwise gain from human models. Why use a sheep brain: large. Disorders: many of the same structures, less cost. 5 gross features: the dorsal surface / cerebellum / brain stem. Page 215-216: appendix, need to know what is on this slide / appendix (7, structures clearly identified. Not hard, but a lot of new terminology. Reductionist approach: breaking down analysis for a better understanding. What changes as a result of molecular (gene) manipulation at a cellular level.