The brain is fairly divided in its functionality. How does this help when someon

The brain is fairly divided in its functionality. How does this help when someone experiences an injury or illness in a certain area of the brain?
Using Google, do a bit of research on the idea of neuroplasticity. Describe neuroplasticity and how this helps us understand the functionality of the brain.
Describe the functionality of the amygdala area of the brain, what might occur if it was damaged by illness or injury, how we might discover this through symptoms or imagery, and what we might expect from the person based on the injury long term.