Final answer:
In Chapter 11, Brian undergoes significant changes in both his mind and body. He becomes filled with a strong vigor, and some aspects of his personality change after an accident. However, it is worth mentioning that some accounts may be exaggerated, and certain behaviors could be attributed to pain medication. The chapter also highlights evidence of the brain's ability to recover after trauma.
Step-by-step explanation:
Brian's mind and body underwent significant changes in Chapter 11. In the chapter, it is mentioned that Brian's idleness has passed, and he is now filled with a keen and fierce vigor. The difficulties and perils he faced previously seem distant and hard to remember. Additionally, friends describe Brian as no longer acting like himself. Before the accident, he was hardworking and amiable, but afterward, he became irritable, temperamental, and lazy. However, it is important to note that some of these accounts may have been exaggerated, and some of his behavior could be attributed to alcohol used as a pain medication. Nevertheless, the accounts suggest that certain aspects of his personality did change. The chapter also introduces new evidence that shows Brian became a functioning stagecoach driver, indicating that the brain has the ability to recover even from major trauma.