early 1970s, that Yale had offered no course called "Perceptions 301" at the time, and that Carson's photo had never appeared in the Yale Daily News. Carson, while acknowledging the class number was not correct, said: "You know, when you write a book with a co-writer and you say that there was a class, a lot of [the] time they'll put a number or something just to give it more meat. You know, obviously, decades later, I'm not going to remember the course number." Medical school Carson entered the University of Michigan Medical School in 1973, and at first he struggled academically, doing so poorly on his first set of comprehensive exams that his faculty adviser recommended he drop out of medical school or take a reduced academic load and take longer to finish. He continued with a regular academic load, and his grades improved to average in his first year of medical school. By his second year of medical school, Carson began to excel academically by seldom attending lectures and instead studying textbooks and lecture notes from 6a.m. to 11p.m. Carson graduated from the University of Michigan Medical School with an M.D. degree in 1977, and he was elected to the Alpha Omega Alpha Honor Medical Society. Carson was then accepted by the Johns Hopkins University School of Medicine neurosurgery program, where he served one year as a surgical intern and five years as a neurosurgery resident, completing the final year as chief resident in 1983. He then spent one year (1983–1984) as a Senior Registrar in neurosurgery at the Sir Charles Gairdner Hospital in Nedlands, a suburb of Perth, Western Australia. Medical career Upon returning to Johns Hopkins in 1984, Carson was appointed the university's director of pediatric neurosurgery. As a surgeon, he specialized in traumatic brain injuries, brain and spinal cord tumors, achondroplasia, neurological and congenital disorders, craniosynostosis, epilepsy, and trigeminal neuralgia. While at Johns Hopkins, Carson figured in the revival of the hemispherectomy, a drastic surgical procedure in which part or all of one hemisphere of the brain is removed to control severe pediatric epilepsy. Encouraged by John M. Freeman, he refined the procedure in the 1980s and performed it many times. In 1987, Carson was the lead neurosurgeon of a 70-member surgical team that separated conjoined twins Patrick and Benjamin Binder, who had been joined at the back of the head (craniopagus twins). The separation