Lloyd, who was watching television in his apartment late at night, heard a thump on the roof of his house. His heart started to pound before he even realized what was happening. What is the reason for this?

The sensory information can reach the amygdala rapidly along routes that are separate from the pathway going to the cortex. Amygdala is the part of the central nervous system that plays a key role in emotions. The amygdala is the part of the limbic system in the central nervous system. In both animals and human beings, this part of the system is related to the fear responses and pleasures. In the human, it is the most sexually dys-morphic brain structure and shrinks in male more than forty percent upon castration. There are the condition such as anxiety, depression, the phobia is suspected to the abnormal activities of the amygdala owing to damage, developmental problems, and neurotransmitter imbalances.