Change of Perspective

In the movie "21," which chronicles the adventures of a bunch of MIT students counting blackjack cards in Vegas, the instigating professor presents a probability problem to his class. It goes something like this:

Professor: I have 3 doors. A car is behind one of them. Pick one.
Student: I pick Door 1.
Professor: OK, what if I tell you that the car is not behind Door 3? Do you want to keep Door 1 or switch your answer to Door 2?
Student: I'll switch to Door 2.
Professor (clearly impressed): Why?
Student: When I first picked, I had a 33% chance of being right. Once you took away one option, the odds changed....

My understanding of the math gets fuzzy right around there, but I've been thinking about that scene lately and how getting a piece of new information can change how you think or feel about something. Two recent situations have illustrated this.

A week and a half ago, I took my Biochemistry and Anatomy midterms. I was somewhat terrified going in, convinced that no amount of studying would make me feel fully prepared, and aware that, given my proclivity for sleeping, eating, and exercising on a fairly regular basis, I didn't have time for unending cram sessions anyway. I entered the tests feeling that I had prepared to the best of my ability and reminding myself that all I really needed to do was pass.

Last week as I walked to my mailbox to get my graded anatomy exam, I repeated my mantra: "All I need is a 65; I'll be happy with that" over and over. I took one look at my grade (safely above a 65) and thought, "Crap! I want to do better than that!" Once I had that assurance that I was passing, my goals changed. In the end, I scored above average on both tests. That knowledge has made me enjoy my subsequent studying even more; some of the fear of failure has been replaced by fascination with the information I'm studying, which I think is a healthy switch.

The second instance of a change in perspective occurred last Friday in Anatomy lecture. As we study the branches of the facial nerve, we learn about Bell's Palsy, in which a nerve injury leads to symptoms such as a drooping of one corner of the eye and mouth. We also saw pictures of people who have just one nerve injured, and saw that an injury to the marginal mandibular nerve results in the bottom lip being paralyzed on one side, making it look like the other side droops. This injury can occur when a person has surgery on their submandibular glands for cancer, and indeed, the person in the picture has sort of an indentation right under his jaw.

Suddenly my mind flashed to my 9th grade Earth Science teacher, Mr. Pearlmutter, with his asymmetrically drooping lip and what looked like a strange indentation in his upper neck. This man who we ignorant teenagers had made fun of had most likely suffered a nerve injury during a surgery (possibly for cancer)! I felt really terrible and want to apologize to him, wherever is he is now. I'm so sorry Mr. Pearlmutter!