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The limbic system
The limbic system includes the hippocampus, the thalamus, the amygdala, and the hypothalamus, and is used to describe the part of the brain responsible for memory, emotions, mood, the experience of pleasure and pain, and the sense of smell, as well as various appetites. One part of the limbic system, the hypothalamus, regulates sleep, body temperature, sexual drive, and reactions to stress. When any part of this intricate system gets out of regulation, it affects the above functions, including moods.
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