Your Personal Pathology; January 2004; Scientific American Mind; by Robert M. Sapolsky; 2 Page(s)

Let's start with Chuck and Arthur. Chuck works in marketing. Extroverted, charismatic, he's the life of the party in a shallow sort of way; confident and flirtatious, having fidelity problems in his third marriage.

In contrast, Arthur works in accounting. Obsessive, rigidly ethical, he is reliable in his work, to the point that colleagues exploit him; lives alone, spends evenings building model ships.