Breathing is primarily involuntary and generated for metabolic and homeostatic purposes in the brainstem. However, changes in breathing can be voluntary or altered by various environmental stimuli. Therefore, breathing is categorized as either metabolic or behavioral. Breathing that changes during various emotions is a subcategory of behavioral breathing due to the strong connection it has with emotion and behavior. The limbic system, located in the medio-temporal lobe of the brain, is the center that governs emotion.