The benefits of brain plasticity are most clearly demonstrated in

children who have had a cerebral hemisphere surgically removed.

Explanation:

The term Brain plasticity also known as Neuroplasticity, refers to the ability of the brain to be able to continuously change an adapt to new experience throughout an individual's life. That being said this is most clearly demonstrated in children who have had a cerebral hemisphere surgically removed. That is because the other half adapts and is able to make up for many of the missing functions.