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The nervous system orchestrates diverse behaviors such as reproduction,sleep,feeding,and aggression,and selects a single behavior for execution at any given time.This requires neural mechanisms for behavioral selection sensitive to both internal physiological states and external environmental conditions.For example,hungry animals bias their selection towards the acquisition and ingestion of food,and away from other behaviors.Despite its tremendous biological importance,as well as substantial progress on the neuronal control of individual behaviors,how neural circuits underlying individual behaviors interact to ensure proper behavioral selection remains poorly understood.