What animal models do we use to study neuronal function? From "simpler" to "complex":

• Mollusks with simple central nervous systems; ~10,000 larger neurons and a million synaptic connections
• Insects with social behaviors
• Mammals that are relevant to human disease and function

Choose the ideal system:

• Learning and memory
• Neuronal control of behavior
• Neuronal repair
• Novel cell-cell signaling pathways
• And, do not forget, match the tool!