The term limbic system usually designates the following anatomically interconnected structures: the hypothalamus, the amygdala, the hippocampus, the septal area, and the cingulate gyrus. From a functional point of view, this classification can be justified by the fact “that many, if not all, of the effects produced by stimulation and lesions of the extrahypothalamic limbic structures can be replicated by stimulation or lesions of the hypothalamus” (Isaacson 1982, p. 2).