Final answer:
Bilateral lesions of the amygdala cause Klüver-Bucy syndrome, which includes a range of symptoms such as hypersexuality and hyperorality, along with disinhibited behavior. The amygdala is essential for sexual motivation, distinct from the ability to perform sexual behavior, and is also involved in emotional processing and mood regulation.
Step-by-step explanation:
Bilateral lesions of the amygdala cause Klüver-Bucy syndrome, leading to hypersexuality, hyperorality (fixation on oral exploration), and disinhibited behavior, but primitive reflexes will be absent. This condition occurs because the amygdala and other limbic system structures, such as the nucleus accumbens, are particularly crucial for sexual motivation based on animal research. While these areas do not affect the ability to engage in sexual behavior, they do influence the drive to engage in such behavior. This is separate from the capacity to perform sexual actions, which is associated with other brain regions like the medial preoptic area of the hypothalamus. Additionally, the amygdala's role in emotional processing and psychological states is significant, as abnormal amygdala activity can be linked with mood disorders and is seen in those at risk for or suffering from these conditions.