The limbic system is composed of four main brain structures: the hypothalamus, the amygdala, the thalamus, and the hippocampus. It helps regulate behavioral and emotional responses, especially survival-related responses, such as eating behavior. The limbic system and the prefrontal cortex have a reciprocal relationship. The automatic and primitive reactions mediated by the limbic system depend highly on the emotion, reasoning, and decision-making functions mediated by the prefrontal cortex and vice versa.
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