Context: Based on discoveries made through neural mapping of the limbic system, the neurobiological explanation of human emotion is that emotion is a pleasant or unpleasant mental state organized in the limbic system of the mammalian brain. If distinguished from reactive responses of reptiles, emotions would then be mammalian elaborations of general vertebrate arousal patterns, in which neurochemicals (for example, dopamine, noradrenaline, and serotonin) step-up or step-down the brain's activity level, as visible in body movements, gestures and postures. Emotions can likely be mediated by pheromones (see fear).

Question: What system was examined to develop the neurobiological explanation of human emotion?
Answer: limbic

Question: What classification of chemicals do dopamine, serotonin and noradrenaline belong to?
Answer: neurochemicals

Question: What chemicals may mediate emotions?
Answer: pheromones

Question: Reactive responses are present in the brains of what animals?
Answer: reptiles

Question: The neurobiological explanation is specific to what types of brains?
Answer: mammalian

Question: What system wasn't examined to develop the neurobiological explanation of human emotion?
Answer: Unanswerable

Question: What classification of chemicals do dopamine, serotonin and noradrenaline not belong to?
Answer: Unanswerable

Question:  What chemicals do not mediate emotions?
Answer: Unanswerable

Question:  Reactive responses aren't present in the brains of what animals?
Answer: Unanswerable

Question:  The neurobiological explanation isn't specific to what types of brains?
Answer: Unanswerable