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Yes. The limbic system controls emotional responses and personality. Nathan, who was outgoing and now is shy, may have been injured in this area of his brain.Meet Dr. Ghajar | Going On Call | Brain Geography | Chicago Hope Interview | Help/Resources | Teacher's Guide | Transcript | Coma Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated October 2000 |