Final answer:
The fear response that Megan experiences is caused by the amygdala in the limbic system.
Step-by-step explanation:
The fear response that Megan experiences is caused by the amygdala in the limbic system.
The amygdala is a structure within the limbic system that processes fear and is responsible for the emotional response to stimuli.
Even though Megan consciously understands that she does not have to be afraid of cats, her amygdala still triggers a fear response.